Electromagnetic valve piston rod with damping function

Abstract

The utility model discloses an electromagnetic valve piston rod with a damping function, and belongs to the field of electromagnetic valves.The electromagnetic valve piston rod with the damping function comprises a fixing frame, a coil fixing barrel is fixedly installed in the fixing frame, and an iron core piston rod is movably arranged in the coil fixing barrel in the axial direction; a coil used for being connected with electricity to drive the iron core piston rod to move according to the electromagnetic principle is wound outside the coil fixing barrel, and the end, away from the movable end, of the iron core piston rod is sleeved with an air piston cylinder fixedly connected with the end of the fixing frame. And a piston which is fixed on the iron core piston rod and is in contact with the inner wall of the working cavity is arranged in the working cavity of the air piston cylinder. According to the electromagnetic valve piston rod with the shock absorption function, through the arrangement of the air piston cylinder and the external pipe, air flowing and pressure balance are achieved, impact force generated when the iron core piston rod moves rapidly is effectively relieved, and the shock absorption effect is achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electromagnetic valves, and particularly relates to an electromagnetic valve piston rod with a damping function. BACKGROUND

[0002] The electromagnetic valve is an industrial equipment controlled by electromagnetism, is an automatic basic element for controlling fluid, belongs to an actuator, and is not only limited to hydraulic pressure and air pressure but is also widely used in industrial control systems to adjust the direction, flow, speed and other parameters of a medium.

[0003] A Chinese utility model patent with the publication number CN218719169U discloses an electromagnetic valve piston rod with a damping function, which is provided with three pairs of springs at the positions of the two ends of the corresponding piston rod to avoid hard contact, provide buffering and avoid vibration. However, the input of too many springs increases the overall weight of the electromagnetic valve, and secondly, the electromagnetic valve body is small, which limits the size of the spring to be smaller, and the damping coefficient that can be provided is lower, so it is only suitable for use in an environment with small acting force.

[0004] Therefore, the application provides an electromagnetic valve piston rod with a damping function to solve the above problems. CONTENT

[0005] The application provides an electromagnetic valve piston rod with a damping function, and aims to solve the problem that the existing electromagnetic valve piston rod with a damping function provided with damping protection by multiple groups of springs has a large overall weight of the electromagnetic valve and a small damping coefficient due to the size limitation and a small application range.

[0006] To achieve the above-mentioned purpose, the application provides the following technical scheme: an electromagnetic valve piston rod with a damping function, comprising a fixed frame.

[0007] A coil fixing cylinder is fixedly installed in the fixed frame, an iron core piston rod is movably arranged in the coil fixing cylinder in the axial direction, a coil is wound outside the coil fixing cylinder and is used for being connected to electricity to drive the iron core piston rod to move by using the electromagnetic principle, an air piston cylinder fixedly connected with the end part of the fixed frame is sleeved at one end of the iron core piston rod away from the movable end, a piston fixed on the iron core piston rod and in contact with the inner wall of the working cavity is arranged in the working cavity of the air piston cylinder, a first air hole and a second air hole are respectively arranged at the positions corresponding to the two ends of the piston of the air piston cylinder, the first air hole and the second air hole are both in communication with the two ends of the working cavity, and the other ends of the first air hole and the second air hole are in communication with each other through an external connecting pipe. In this way, the flow and pressure balance of air are realized through the arrangement of the air piston cylinder and the external connecting pipe, the impact force generated when the iron core piston rod moves quickly is effectively reduced, and the damping effect is achieved.

[0008] Preferably, the connection between the iron core piston rod and the air piston cylinder is provided with a sealing sleeve.

[0009] Preferably, the movable end of the iron core piston rod is provided with a limiting ring, and the end cover is fixedly installed at one end of the limiting ring, and the conical compression spring is sleeved on the outside of the movable end of the iron core piston rod between the end cover and the limiting ring.

[0010] Preferably, the two ends of the conical compression spring are in contact with the limiting ring and the end cover respectively.

[0011] Preferably, the coil is provided with wire terminals penetrating the side surface of the fixed frame at both ends.

[0012] Preferably, one end of the iron core piston rod away from the movable end is provided with a plunger matching the first air hole, and the air piston cylinder is provided with a buffer air hole in communication with the working cavity and the first air hole at both ends, and the diameter of the buffer air hole is smaller than that of the first air hole.

[0013] The electromagnetic valve piston rod with damping function realizes the flow and pressure balance of air through the setting of the air piston cylinder and the external pipe, effectively reduces the impact force generated by the iron core piston rod when moving quickly, and achieves the effect of damping.

[0014] Compared with the traditional damping protection mode provided by multiple springs, the electromagnetic valve piston rod with damping function adopts the structure of air piston cylinder and external pipe, greatly simplifies the overall structure of the electromagnetic valve, and reduces the weight of the electromagnetic valve.

[0015] The electromagnetic valve piston rod with damping function effectively prevents the impact of the iron core piston rod on the tail end and the inner wall of the air piston cylinder when quickly pushing back, thereby protecting the structural integrity of the air piston cylinder and prolonging its service life. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of an electromagnetic valve piston rod with damping function.

[0017] Figure 2 It is a structural schematic diagram of an electromagnetic valve piston rod with damping function.

[0018] In the figure:

[0019] 1, fixed frame; 11, end cover; 2, coil fixing cylinder;

[0020] 3, coil; 31, wire terminal;

[0021] 4, iron core piston rod; 41, piston; 42, plunger; 43, limiting ring;

[0022] 5. air cylinder; 51. working chamber; 52. first air hole; 53. second air hole; 54. buffer air hole; 6. external pipe; 7. conical compression spring. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0024] Embodiment 1

[0025] The present embodiment provides a shock-absorbing electromagnetic valve piston rod, as shown in Figure 1 and Figure 2 The shock-absorbing electromagnetic valve piston rod comprises a fixed frame 1.

[0026] A coil fixing cylinder 2 is fixedly installed in the fixed frame 1. An iron core piston rod 4 is movably arranged in the coil fixing cylinder 2 in the axial direction. A coil 3 is wound outside the coil fixing cylinder 2 for electric connection to drive the iron core piston rod 4 to move by the electromagnetic principle. An air cylinder 5 is fixedly connected to the end of the fixed frame 1 and is sleeved on the end of the iron core piston rod 4 away from the movable end. A piston 41 is fixed on the iron core piston rod 4 and is in contact with the inner wall of a working chamber 51 of the air cylinder 5. First and second air holes 52 and 53 are respectively formed at positions corresponding to the two ends of the piston 41 of the air cylinder 5, and the first and second air holes 52 and 53 are both in communication with the two ends of the working chamber 51. The other ends of the first and second air holes 52 and 53 are in communication with each other through an external pipe 6.

[0027] In use, when the coil 3 is electrified, the iron core piston rod 4 will move under the action of electromagnetic force according to the electromagnetic principle. This movement will drive the piston 41 to move in the working chamber 51, thereby changing the volume of air at the two ends of the working chamber 51. Since the first and second air holes 52 and 53 are connected through the external pipe 6, when the piston 41 moves, the volume of air on one side decreases and the pressure increases, while the volume of air on the other side increases and the pressure decreases. This pressure difference will cause air to flow from the high-pressure side to the low-pressure side through the external pipe 6, thereby achieving the effects of buffering and shock absorption. When the iron core piston rod 4 is impacted or moves rapidly from outside, the piston 41 will move rapidly in the working chamber 51, generating a large air pressure difference. At this time, the air flow passage provided by the external pipe 6 can rapidly balance this pressure difference, thereby slowing down the moving speed of the piston 41 and achieving the effect of shock absorption.

[0028] It should be noted that the connection between the iron core piston rod 4 and the air piston cylinder 5 has a sealing sleeve; the sealing sleeve is usually made of elastic material, which can tightly fit between the outer surface of the iron core piston rod 4 and the inner surface of the air piston cylinder 5, forming an effective sealing barrier. When the iron core piston rod 4 moves under the action of electromagnetic force, the sealing sleeve can maintain its elasticity and sealing performance to prevent air leakage from the working cavity 51 to the outside.

[0029] Further, the movable end of the iron core piston rod 4 has a limiting ring 43, and the end cover 11 is fixedly installed on one end of the fixed frame 1 close to the limiting ring 43. The conical compression spring 7 sleeved on the outer part of the movable end of the iron core piston rod 4 is arranged between the end cover 11 and the limiting ring 43. The two ends of the conical compression spring 7 are in contact with the limiting ring 43 and the end cover 11, respectively. When the iron core piston rod 4 moves, the conical compression spring 7 will be compressed or stretched, thereby providing additional damping effect.

[0030] Specifically, the coil 3 has a wire terminal 31 penetrating the side surface of the fixed frame 1 at both ends; when the external power supply supplies power to the coil 3 through the wire terminal 31, the coil 3 will generate an electromagnetic field, thereby driving the iron core piston rod 4 to move.

[0031] Embodiment 2

[0032] Different from embodiment 1, when the electromagnetic valve is started, the iron core piston rod 4 is pulled back, and at the same time, the iron core piston rod 4 is quickly pushed back under the action of external force, which is easy to cause the tail end of the iron core piston rod 4 to impact the inner wall of the air piston cylinder 5, thereby damaging the inner wall of the air piston cylinder 5 and reducing its service life. Therefore, one end of the iron core piston rod 4 away from the movable end has a plunger 42 matching the hole diameter of the first gas hole 52, and the air piston cylinder 5 is provided with a buffer gas hole 54 having two ends respectively communicating with the working cavity 51 and the first gas hole 52, and the hole diameter of the buffer gas hole 54 is smaller than that of the first gas hole 52.

[0033] In order to solve the problem, a plunger 42 with the same diameter as the first air hole 52 is designed at the end of the iron core piston rod 4 far from the moving end. When the iron core piston rod 4 is quickly pushed back by external force, the plunger 42 will first enter the first air hole 52. However, since the diameter of the plunger 42 is the same as that of the first air hole 52, the plunger 42 will temporarily close the first air hole 52, preventing the air in the working chamber 51 from quickly flowing out through the first air hole 52. At the same time, the buffer air hole 54 in the air piston cylinder 5 plays a key role. The two ends of the buffer air hole 54 are respectively connected with the working chamber 51 and the first air hole 52, but the diameter of the buffer air hole 54 is smaller than that of the first air hole 52. Therefore, when the plunger 42 closes the first air hole 52, the air in the working chamber 51 can still slowly flow out through the buffer air hole 54, forming a buffer area. This buffer area can slow down the moving speed of the iron core piston rod 4, preventing the tail end of the iron core piston rod 4 from impacting the inner wall of the air piston cylinder 5 at a too high speed.

[0034] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes to the technical solution and concept of the present application within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application.

Claims

1. An electromagnetic valve piston rod with shock absorption function, comprising a fixing frame (1), characterized in that: The fixed frame (1) is internally fixedly installed with a coil fixing cylinder (2), the coil fixing cylinder (2) is internally axially movably provided with an iron core piston rod (4), the coil fixing cylinder (2) is externally wound with a coil (3) for power connection to drive the iron core piston rod (4) to move by electromagnetic principle, the iron core piston rod (4) is externally sleeved with an air piston cylinder (5) fixedly connected with the end of the fixed frame (1) at the end away from the movable end, the air piston cylinder (5) has a piston (41) fixed on the iron core piston rod (4) and in contact with the inner wall of the working cavity (51) in the working cavity (51), the air piston cylinder (5) is respectively provided with a first air hole (52) and a second air hole (53) at positions corresponding to both ends of the piston (41), and the first air hole (52) and the second air hole (53) are both in communication with both ends of the working cavity (51), and the other end of the first air hole (52) and the second air hole (53) is in communication with each other through an external connecting pipe (6).

2. The electromagnetic valve piston rod with a shock absorbing function according to claim 1, characterized in that: The connecting part of the iron core piston rod (4) and the air piston cylinder (5) has a sealing sleeve.

3. The electromagnetic valve piston rod with a shock absorbing function according to claim 2, characterized in that: The movable end of the iron core piston rod (4) has a limiting ring (43), one end of the fixed frame (1) close to the limiting ring (43) is fixedly installed with an end cover (11), and the end cover (11) and the limiting ring (43) have a conical compression spring (7) sleeved on the outer part of the movable end of the iron core piston rod (4).

4. The electromagnetic valve piston rod with a shock absorbing function according to claim 3, characterized in that: The conical compression spring (7) is in contact with the limiting ring (43) and the end cover (11) at both ends respectively.

5. The piston rod of the electromagnetic valve with a shock absorbing function according to claim 4, characterized in that: Both ends of the coil (3) have wire connection heads (31) penetrating the side surface of the fixed frame (1).

6. The electromagnetic valve piston rod with a shock absorbing function according to claim 5, characterized in that: The end of the iron core piston rod (4) away from the movable end has a plunger (42) matched with the aperture of the first air hole (52), the air piston cylinder (5) is internally provided with a buffer air hole (54) in communication with the working cavity (51) and the first air hole (52) at both ends respectively, and the aperture of the buffer air hole (54) is smaller than the aperture of the first air hole (52).

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