Adjustable valve core switching time solenoid directional valve

Abstract

This invention provides an adjustable valve core switching time electromagnetic directional valve, belonging to the field of directional valve manufacturing. The invention includes a housing and a valve core. The valve core is slidably mounted within the housing. The housing contains two control oil chambers, each with an opening. The two ends of the valve core are located within the two control oil chambers, and the ends of the valve core are used to seal the openings. Each control oil chamber contains an electromagnetic push rod corresponding to the end of the valve core. The housing contains a flow channel connecting the two control oil chambers, and at least one throttling device is provided on this flow channel. This electromagnetic directional valve, by adjusting the flow channel between the two control oil chambers with the electromagnetic push rods, can regulate the valve core's actuation time, thus achieving adjustable valve core switching time without requiring changes to existing electromagnets, effectively overcoming the shortcomings of existing structures.

Description

Technical Field

[0001] This invention relates to valve manufacturing technology, and more particularly to a solenoid directional valve with adjustable valve core switching time, belonging to the field of hydraulic equipment manufacturing technology. Background Technology

[0002] Directional control valves, as hydraulic components that control the opening and closing of oil circuits, are widely used. Common directional control valves are spool-type structures, where the valve core slides within the housing. By switching the valve core, different ports are connected or closed. In particular, electromagnetic directional control valves are widely used in various aspects of industrial production due to their high degree of automation, stable and reliable operation, convenient layout, and fast switching speed.

[0003] As the application fields continue to expand and change, the advantages of electromagnetic directional valves may also become disadvantages in specific situations. For example, the advantage of fast switching speed. The fast switching speed of electromagnetic directional valves reflects their excellent response characteristics; however, fast switching speed often means higher pressure surges, especially in high-pressure systems, where these pressure surges can sometimes reach 3-4 times the operating pressure. Fast switching speed often also implies greater instability, vibration, and noise, and in control systems with pressure feedback control, it often means a higher risk of misoperation.

[0004] The conventional method for adjusting the switching speed of a directional control valve spool is to change the size of the damping orifice in the armature of the electromagnet. This damping effect slows down the armature's actuation speed when it is activated by electromagnetic force, thus delaying its movement and the speed at which it pushes the main valve spool, thereby altering the directional control valve's switching time. However, this method has significant drawbacks: due to varying operating conditions, the required switching time for the directional control valve spool differs, consequently affecting the specific requirements for the damping orifice in the electromagnet armature. Addressing the complex and diverse switching speed requirements of electromagnetic directional control valves using conventional methods often necessitates developing numerous armature specifications, leading to long production cycles, high costs, and an inability to respond promptly and efficiently to diverse market demands.

[0005] The ability to change the valve core switching time of an electromagnetic directional valve means that the valve core orifice of the directional valve has a gradual opening and closing effect. This is of great significance for improving and solving various adverse effects caused by excessively fast switching speed of the directional valve, and it also greatly expands the application space of electromagnetic directional valves. Therefore, there is a need in the existing technology for an electromagnetic directional valve that can change the valve core switching time. Summary of the Invention

[0006] This invention provides a novel electromagnetic directional valve with adjustable valve core switching time. By setting a throttling device between the two control oil chambers of the valve core, the pressure balance speed between the two control oil chambers is adjusted, thereby solving the technical problem that the valve core response speed of the electromagnetic directional valve in the prior art is not adjustable.

[0007] This invention provides an adjustable valve core switching time electromagnetic directional valve, comprising: a housing and a valve core; the valve core is slidably mounted within the housing;

[0008] The housing contains two control oil chambers, each with an opening. The two ends of the valve core are located in the two control oil chambers respectively, and the ends of the valve core are used to seal the openings. Each control oil chamber contains an electromagnetic push rod, which corresponds to the end of the valve core.

[0009] The housing is provided with a flow channel for connecting the two control oil chambers, and at least one throttling device is provided on the flow channel.

[0010] As described above, the valve core switching time adjustable electromagnetic directional valve has a mounting groove on the housing, and the throttling device is installed in the mounting groove; the top of the mounting groove has a threaded opening.

[0011] The top of the throttling device has a nut, through which the throttling device is connected to the threaded joint.

[0012] As described above, the adjustable valve core switching time electromagnetic directional valve includes a throttling device comprising: a valve body, a conical valve core, a valve seat, and a spring; a flow channel is provided inside the valve body; the conical valve core is located between the valve seat and the flow channel, and the conical valve core abuts against the valve seat or the flow channel via the spring to control the opening and closing of the flow channel.

[0013] As described above, the valve core switching time adjustable electromagnetic directional valve has a throttling orifice on the conical valve core, which corresponds to the flow channel opening.

[0014] As described above, the adjustable valve core switching time electromagnetic directional valve further includes a one-way valve core located between the valve seat and the flow channel opening.

[0015] The one-way valve core is connected to the conical valve core via the spring; the conical valve core abuts against the valve seat so that the one-way valve core abuts against the flow channel opening.

[0016] As described above, in the adjustable-time electromagnetic directional valve, electromagnets are respectively provided at both ends of the housing; each electromagnet drives one electromagnetic push rod.

[0017] As described above, the adjustable-time electromagnetic directional valve has a high-pressure oil port and two working oil ports inside the housing. A sliding hole is provided on the housing. The valve core is fitted inside the sliding hole and the sliding hole is sealed by the radial surface of the valve core. The valve core slides to the left or right to create a gap between the radial end face of the valve core and the sliding hole. This gap is used to connect the high-pressure oil port and one of the working oil ports.

[0018] As described above, the adjustable valve core switching time electromagnetic directional valve further includes two return ports inside the housing, with the two return ports located outside the two working ports respectively.

[0019] The valve core slides to connect the high-pressure oil port to one of the working oil ports and to connect the other working oil port to the return oil port.

[0020] As described above, in the adjustable-time electromagnetic directional valve, a return spring is provided in the control oil chamber; the end of the valve core abuts against the control oil chamber through the return spring.

[0021] As described above, the valve core switching time adjustable electromagnetic directional valve, wherein the throttling device is a one-way throttling valve.

[0022] The electromagnetic directional valve of the present invention can adjust the valve core action time by throttling the flow channel between the two control oil chambers equipped with electromagnetic push rods, thereby achieving the purpose of adjustable valve core opening and closing time without changing the existing electromagnet, and effectively making up for the shortcomings of the existing structure. Attached Figure Description

[0023] Figure 1 This is a cross-sectional structural diagram of the adjustable valve core switching time electromagnetic directional valve in the neutral position according to an embodiment of the present invention.

[0024] Figure 2 for Figure 1 Enlarged view of point M in the middle;

[0025] Figure 3 for Figure 1 Enlarged schematic diagram of the throttling device at point N;

[0026] Figure 4 for Figure 1 An enlarged schematic diagram of another throttling device at point N;

[0027] Figure 5 for Figure 1 An enlarged schematic diagram of another structural throttling device at point N. Detailed Implementation

[0028] The adjustable-time electromagnetic directional valve of the valve core described in this invention can be made of the following materials, but is not limited to them, such as: valve core, hydraulic system, electrical control device and other common components.

[0029] Figure 1 This is a cross-sectional view of the adjustable-time electromagnetic directional valve in the neutral position according to an embodiment of the present invention; this embodiment combines... Figure 2 and Figure 3 Please provide an explanation.

[0030] The adjustable valve core switching time electromagnetic directional valve according to an embodiment of the present invention includes: a housing 1 and a valve core 2; the valve core 2 is slidably installed in the housing 1; the valve core 2 is the valve core of the directional valve.

[0031] The housing 1 is provided with two control oil chambers 20, each of which has an opening. The two ends of the valve core 2 are respectively located in the two control oil chambers 20, and the ends of the valve core 2 are used to seal the openings. Each control oil chamber 20 is provided with an electromagnetic push rod 30, which corresponds to the end of the valve core 2.

[0032] Specifically, electromagnets 3 are respectively provided at both ends of the housing 1; each electromagnet 3 drives one electromagnetic push rod 30. In actual use, two electromagnets 3 are respectively provided on both sides of the housing 1 to control the electromagnetic push rods 30. Each electromagnet 3 drives its connected electromagnetic push rod 30 to push one end of the valve core 2, thereby driving the valve core 2 to slide to realize the reversing operation.

[0033] like Figure 1 As shown, the housing 1 is provided with a flow channel 6 for connecting the two control oil chambers, and at least one throttling device 5 is provided on the flow channel 6.

[0034] Under normal circumstances, the throttling device 5 is a one-way throttling valve, which can only throttle the hydraulic oil in the flow channel 6 in one direction.

[0035] The electromagnetic directional valve of the present invention can adjust the valve core action time by throttling the flow channel between the two control oil chambers equipped with electromagnetic push rods, thereby achieving the purpose of adjustable valve core opening and closing time without changing the existing electromagnet, and effectively making up for the shortcomings of the existing structure.

[0036] In this embodiment, the adjustable-time electromagnetic directional valve typically has a high-pressure port P and two working ports (A and B) inside the housing 1. The housing 1 has a sliding hole, and the valve core 2 is fitted inside the sliding hole and the sliding hole is sealed by the radial surface of the valve core 2. The valve core 2 slides to the left or right to create a gap between the radial end face of the valve core 2 and the sliding hole. This gap is used to connect the high-pressure port P with one of the working ports (A or B).

[0037] Normally, the housing 1 is provided with two sliding holes, and the valve core 2 is sleeved in the two sliding holes; the valve core 2 slides to the left or right to open one of the sliding holes, so that the high-pressure oil port is connected to one of the working oil ports, thereby performing a reversing action.

[0038] Normally, the high-pressure oil port is connected to the hydraulic pump in the hydraulic system and is used to release high-pressure hydraulic oil through the high-pressure oil pipe.

[0039] The two working oil ports are connected to both ends of the actuator to facilitate the reversing action through the inlet and outlet oil pipes.

[0040] Furthermore, in this embodiment, the housing 1 is also provided with two oil return ports (Ta and Tb), and the two oil return ports are respectively located outside the two working oil ports;

[0041] The valve core slides to connect the high-pressure oil port to one of the working oil ports and to connect the other working oil port to the return oil port.

[0042] The valve core 2 slides to open PA, PB, A-Ta, and B-Tb respectively, which is used not only to open the working oil port, but also to open the oil passage between the working oil port and the return oil port T.

[0043] The working principle of this embodiment is as follows:

[0044] During the energization and de-energization of the electromagnets, the pressure in the corresponding control oil chamber 20 of each electromagnet changes, such as... Figure 1 and Figure 2 When the right electromagnet 3 is energized, the armature moves to the left due to electromagnetic attraction, which in turn pushes the valve core 2 via the right electromagnetic push rod 30. This increases the total volume of the right control oil chamber 20, causing the pressure Pa inside the chamber to decrease. Simultaneously, the total volume of the left control oil chamber 20 decreases, causing the pressure Pb inside the chamber to increase. During the reversing start-up process, Pa... <Pb。

[0045] Normally, a return spring 4 is installed inside the control oil chamber 20; the end of the valve core 2 rests against the control oil chamber 20 via the return spring 4. When the right electromagnet 3 is de-energized, the electromagnetic thrust disappears, and the valve core 2 moves to the right under the action of the return spring 4, increasing the volume of the left control oil chamber 20 and decreasing the pressure inside. At the same time, the volume of the right control oil chamber 20 decreases, increasing the pressure inside, resulting in Pa > Pb during the reversing and reset process. The process of energizing and de-energizing the left electromagnet is similar to the above process and will not be described again.

[0046] The above analysis shows that there is a pressure imbalance in the two control oil chambers 20 during the process of turning the electromagnet on and off.

[0047] During the reversal process, the pressure imbalance in the two control oil chambers 20 causes the pressure oil to flow from the high-pressure side to the low-pressure side through the flow channel 6. The throttling effect of the throttling device 5 in the flow channel 6 obstructs the flow of the pressure oil.

[0048] On the other hand, the pressure imbalance in the two control oil chambers 20 also affects the force on both sides of the valve core 2, and this unbalanced pressure always tends to hinder the operation of the valve core 2. Thus, the switching time of the valve core 2 is prolonged during the switching process of the electromagnetic directional valve. The extended time can be adjusted by the throttling effect of the throttling device (in this embodiment, it is assumed that the damping effect of the armature of the electromagnet is negligible, therefore the extension of the valve core switching time caused by the throttling effect is controllable).

[0049] This embodiment features a solenoid directional valve with adjustable valve core switching time, such as... Figure 1 and Figure 3 The housing 1 is provided with a mounting groove, and the throttling device 5 is installed in the mounting groove; the top of the mounting groove has a threaded opening; the top of the throttling device 5 has a nut 50, and the throttling device 5 is connected to the threaded opening through the nut 50.

[0050] The threaded design allows the throttling device 5 to be detachably installed on the housing, thereby enabling the adjustment of the valve core 2's actuation time by adjusting the throttling effect of the throttling device.

[0051] like Figure 3 , Figure 4 and Figure 5 As shown, the adjustable valve core switching time electromagnetic directional valve of this embodiment includes a throttling device 5 comprising: a valve body 51, a conical valve core 53, a valve seat 55, and a spring 54; the valve body 51 is provided with a flow channel 52; the conical valve core 53 is located between the valve seat 55 and the flow channel 52, and the conical valve core 53 abuts against the valve seat 55 or the flow channel 52 through the spring 51 to control the opening and closing of the flow channel 52.

[0052] like Figure 4As shown, the conical valve core 53 abuts against the flow channel opening 52 via the spring 51; as Figure 5 As shown, the conical valve core 53 abuts against the valve seat 55 via the spring 51.

[0053] Furthermore, such as Figure 4 and Figure 5 As shown, the conical valve core 53 is provided with a throttling orifice 530, which corresponds to the flow channel opening 52.

[0054] The conical valve core 53 contacts and cooperates with the flow port 52 or the valve seat 55 to form a one-way control effect on the hydraulic oil. At this time, the throttling area can be changed by changing the size of the throttling orifice 530, thereby changing the hydraulic resistance at the moment of directional valve switching, and finally realizing the changeability of the valve core switching time.

[0055] like Figure 4 The throttling device structure (valve seat 55 is replaced by a part of housing 1) means that when the right electromagnet is energized or the left electromagnet is de-energized, Pa < Pb. The pressure oil in the left control oil chamber passes through the throttling hole 530 on the throttling device 5 and enters the right control oil chamber through the flow channel 6. In this way, the switching time of the directional valve core can be changed when the right electromagnet is energized or the left electromagnet is de-energized.

[0056] exist Figure 4 In this structure, when the right electromagnet is de-energized or the left electromagnet is energized, the pressure oil in the right control oil chamber overcomes the spring force to push open the conical valve core 53 and enters the throttling device. It then quickly enters the left control oil chamber through the flow channel 52. At this time, the throttling device is only equivalent to a one-way valve and has no throttling effect.

[0057] Figure 4 The structure enables control over the action time of valve core 2 when the right-side electromagnet is activated; for example... Figure 5 The throttling device structure enables control over the action time of valve core 2 when the left electromagnet is started.

[0058] The valve core reversing time can be changed by adjusting the inner diameter of the throttling orifice 530 at the center of the conical valve core 53.

[0059] The one-way valve core has a variable throttling groove on its conical surface.

[0060] like Figure 3 As shown, in this embodiment of the adjustable valve core switching time electromagnetic directional valve, the throttling device 5 further includes: a one-way valve core 56; the one-way valve core 56 is located between the valve seat 55 and the flow port 52;

[0061] The one-way valve core 56 is connected to the conical valve core 53 via the spring 54; the conical valve core 53 abuts against the valve seat 55 so that the one-way valve core 56 abuts against the flow port 52.

[0062] like Figure 3 The throttling device structure allows Pa < Pb during the process of energizing the right electromagnet a or de-energizing the left electromagnet b. The pressure oil in the left control oil chamber overcomes the spring force and pushes open the conical valve core 53 to enter. It then enters the right control oil chamber through the throttling effect of the variable throttling slot formed by the cooperation of the one-way valve core 56 and the flow channel 52. In this way, the switching time of the directional valve core can be changed when the electromagnet a is energized or the electromagnet b is de-energized.

[0063] When the left electromagnet b is energized or the right electromagnet a is de-energized, Pa > Pb. The pressure oil in the right control oil chamber overcomes the spring force and pushes open the one-way valve core 56 to enter the throttling device. Then, it enters the left control oil chamber through the throttling effect of the throttling hole 530 of the conical valve core 53. In this way, the switching time of the directional valve core can be changed when the electromagnet b is energized or the electromagnet a is de-energized.

[0064] In this example, the variable throttling slot of the one-way valve core 56 abuts against the flow channel port 52, and the throttling area of ​​the throttling port can be changed by controlling the abutting position.

[0065] Figure 3 The throttling device of the structure allows for independent adjustment of the switching time of the valve core 2 in both directions of the reversing valve. To ensure the throttling effect in both directions, a throttling groove is provided on the contact surface between the one-way valve core 56 and the flow port 52, thereby ensuring that the throttling effect can be achieved during use and avoiding the formation of a simple one-way check valve, which would affect the normal operation of the equipment.

[0066] The one-way valve core 56 and the conical valve core 53 have the same function, but their structures can be different for practical use, as long as the throttling effect can be controlled. The throttling groove of the one-way valve core 56 has the same function as the throttling orifice 530 on the conical valve core 53, and the valve core switching time can be changed by adjusting the cross-sectional area of ​​the throttling groove.

[0067] The proportional directional valve structure of the present invention adopts a throttling hydraulic oil structure design, which is simple in structure and low in cost. It can effectively make up for the shortcomings of the existing structure, realize the control of the valve core action time of the directional valve, and enable the electromagnetic directional valve to have a wider range of application scenarios.

[0068] The sequence numbers of the above embodiments of the present invention are merely for descriptive purposes and do not represent the superiority or inferiority of the embodiments. Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of some modifications and the superposition of necessary general technologies; of course, they can also be implemented by simplifying some important technical features. Based on this understanding, the technical solution of the present invention, in essence or the part that contributes to the prior art, is: the overall function and structure, and the structure described in the various embodiments of the present invention.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A solenoid directional valve with adjustable valve core switching time, characterized in that, Includes: a housing and a valve core; the valve core is slidably mounted within the housing; The housing contains two control oil chambers, each with an opening. The two ends of the valve core are located in the two control oil chambers respectively, and the ends of the valve core are used to seal the openings. Each control oil chamber contains an electromagnetic push rod, which corresponds to the end of the valve core. The housing is provided with a flow channel for connecting the two control oil chambers, and at least one throttling device is provided on the flow channel; The housing is provided with a mounting groove, and the throttling device is installed in the mounting groove; the top of the mounting groove has a thread; the top of the throttling device has a nut, and the throttling device is connected to the thread through the nut; The throttling device includes: a valve body, a conical valve core, a valve seat, and a spring; a flow channel is provided in the valve body; the conical valve core is located between the valve seat and the flow channel, and the conical valve core abuts against the valve seat or the flow channel through the spring to control the opening and closing of the flow channel; The conical valve core is provided with a throttling orifice, which corresponds to the flow channel opening; The throttling device further includes: a one-way valve core; the one-way valve core is located between the valve seat and the flow channel opening; the one-way valve core is connected to the conical valve core through the spring; the conical valve core abuts against the valve seat so that the one-way valve core abuts against the flow channel opening; a throttling groove is provided on the contact surface between the one-way valve core and the flow channel opening.

2. The adjustable-time electromagnetic directional valve according to claim 1, characterized in that, Electromagnets are respectively provided at both ends of the housing; each electromagnet drives one electromagnetic push rod.

3. The adjustable-time electromagnetic directional valve according to claim 1, characterized in that, The housing is provided with a high-pressure oil port and two working oil ports. The housing is provided with a sliding hole. The valve core is sleeved in the sliding hole and the sliding hole is sealed by the radial surface of the valve core. The valve core slides to the left or right to make a gap between the radial end face of the valve core and the sliding hole. This gap is used to connect the high-pressure oil port and one of the working oil ports.

4. The adjustable-time electromagnetic directional valve according to claim 3, characterized in that, The housing is also provided with two oil return ports, which are located on the outside of the two working oil ports respectively; The valve core slides to connect the high-pressure oil port to one of the working oil ports and to connect the other working oil port to the return oil port.

5. The adjustable-time electromagnetic directional valve according to claim 1, characterized in that, A return spring is provided inside the control oil chamber; the end of the valve core abuts against the control oil chamber through the return spring.

Images