Proportional control reversing valve

Abstract

The utility model discloses a proportional control reversing valve relates to proportional valve technical field. Its main technical scheme: including first elastic part, spring lock dead nut and second elastic part, two ends of first elastic part are connected in valve core and oil sealing nut respectively, spring lock dead nut is located between valve core and driving part, and spring lock dead nut is sleeved in the connecting shaft of driving part, second elastic part is arranged in the one end of spring lock dead nut away from driving part, and two ends of second elastic part are connected in valve body and spring lock dead nut respectively. In the reset process, the restoring force of first elastic part and second elastic part is added, improves the total reset force of valve core, thereby promotes valve core fast, reliably and returns the mid -position. Expect to reach the purpose of effectively overcoming the friction resistance and adsorption force caused by the pollutant (such as particle, oil sludge) adhesion in the clearance between valve core and valve body in high pressure oil, and then reduces the risk of valve core jam or even jamming caused by the insufficient reset force.

Description

Technical Field

[0001] This utility model relates to the field of proportional valve technology, specifically to a proportional control directional valve. Background Technology

[0002] A proportional valve is a type of hydraulic valve that converts an input electrical signal into force or displacement proportionally, thereby continuously controlling parameters such as pressure and flow rate.

[0003] Existing proportional valves typically employ a symmetrical arrangement of two electromagnets and two springs: when one electromagnet is energized, it drives the corresponding spring to compress or extend, pushing the valve core in the corresponding direction; conversely, when the other electromagnet is energized, it drives the corresponding spring to compress or extend, pushing the valve core in the corresponding direction. However, the two springs operate independently, lacking a synergistic mechanism, making it difficult to form an effective combined force or synchronous reset capability during dynamic response and reset. When contaminants are present in the high-pressure oil, the valve core is prone to jamming or even seizing due to insufficient reset force. Utility Model Content

[0004] The purpose of this utility model is to provide a proportional control directional valve, which solves the problem that in the existing proportional control directional valve, the two springs work independently and lack a coordinated action mechanism, making the valve core prone to jamming or even seizing due to insufficient reset force.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A proportional control directional valve is provided, comprising a first elastic element, a spring-locking nut, and a second elastic element. The two ends of the first elastic element are respectively connected to a valve core and a sealing nut. The spring-locking nut is disposed between the valve core and a drive component, and is sleeved on the connecting shaft of the drive component. The second elastic element is disposed at the end of the spring-locking nut away from the drive component, and the two ends of the second elastic element are respectively connected to a valve body and the spring-locking nut.

[0007] A further technical solution is as follows: the first elastic element includes a first spring seat and a first spring; the first spring seat is disposed at one end of the valve core near the oil sealing nut; the two ends of the first spring are respectively connected to the first spring seat and the oil sealing nut.

[0008] A further technical solution is that the proportional control directional valve also includes a valve sleeve; the valve sleeve is disposed in the valve body; the valve core passes through the valve sleeve, and the end of the valve sleeve near the drive member is connected to the second elastic member.

[0009] A further technical solution is that the valve sleeve is provided with oil passage holes; the oil passage holes are symmetrically distributed on the valve sleeve.

[0010] A further technical solution is as follows: the second elastic element includes a second spring seat and a second spring; the second spring seat is sleeved on the connecting shaft of the driving member, and the second spring seat is connected to the valve sleeve; the second spring is sleeved on the connecting shaft of the driving member, and the two ends of the second spring are respectively connected to the second spring seat and the spring locking nut.

[0011] A further technical solution is that the driving component is a linear stepper motor with a closed-loop absolute encoder.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] During the reset process, the restoring forces of the first and second elastic elements are superimposed, increasing the total reset force of the valve core, thereby driving the valve core to return to the neutral position quickly and reliably. This aims to effectively overcome the frictional resistance and adsorption force caused by contaminants (such as particles and sludge) in the high-pressure oil adhering to the gap between the valve core and the valve body, thereby reducing the risk of valve core jamming or even seizing due to insufficient reset force. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a proportional control directional valve in this embodiment.

[0015] The attached diagram shows the markings and corresponding component names:

[0016] 1-First elastic element; 11-First spring seat; 12-First spring;

[0017] 2-Valve core; 3-Oil sealing nut; 4-Spring locking nut; 5-Drive component;

[0018] 6-Second elastic element; 61-Second spring seat; 62-Second spring;

[0019] 7-Valve body; 8-Valve sleeve; 9-Oil passage hole. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Example 1: This example provides a proportional control directional valve, such as... Figure 1 As shown, it includes a first elastic element 1, a spring-locking nut 4, and a second elastic element 6. The two ends of the first elastic element 1 are respectively connected to the valve core 2 and the oil-sealing nut 3. The spring-locking nut 4 is disposed between the valve core 2 and the driving element 5, and the spring-locking nut 4 is sleeved on the connecting shaft of the driving element 5. The second elastic element 6 is disposed at the end of the spring-locking nut 4 away from the driving element 5, and the two ends of the second elastic element 6 are respectively connected to the valve body 7 and the spring-locking nut 4.

[0022] For example, in the implementation process, the valve core 2 is inserted into the valve body 7.

[0023] The oil sealing nut 3 is connected to one end of the valve body 7 by means of screwing, welding or other methods, and the oil sealing nut 3 and the valve body 7 are sealed together.

[0024] The first elastic element 1 is disposed inside the valve body 7. The first elastic element 1 is located between the oil sealing nut 3 and the valve core 2. One end of the first elastic element 1 is connected to the oil sealing nut 3 by means of welding, screwing, or abutting. The other end of the first elastic element 1 is connected to the valve core 2 by means of welding, screwing, or abutting.

[0025] The drive component 5 can be a non-electromagnetic magnet, a proportional electromagnet, a stepper motor, or other drive mechanism. The drive motor is connected to the other end of the valve body 7 by welding, screwing, or other methods, and the connecting shaft of the drive component 5 is connected to one end of the valve core 2 by welding, screwing, or other methods.

[0026] A spring-locking nut 4 is installed inside the valve body 7. The spring-locking nut 4 is sleeved on the connecting shaft of the drive component 5, and the spring-locking nut 4 is connected to the connecting shaft of the drive component 5 by means of welding, screwing, or other methods.

[0027] The second elastic element 6 is disposed inside the valve body 7 and is sleeved on the connecting shaft of the drive element 5. One end of the second elastic element 6 is connected to the spring locking nut 4 by means of welding, screwing, or abutment. The other end of the first elastic element 1 is connected to the valve body 7 by means of welding, screwing, or abutment.

[0028] In the specific implementation process, the initial / neutral state (no drive signal): when there is no electrical signal input, the drive element 5 (electromagnet) does not work, the first elastic element 1 and the second elastic element 6 are in the natural state, and the valve core 2 is maintained in the neutral position (or the preset initial position).

[0029] Driving process (application of driving signal): When the driving component 5 (electromagnet) operates, the driving component 5 pushes the spring-locking nut 4 and the valve core 2, moving along the driving component 5 towards the oil-sealing nut 3. At this time, the first elastic element 1 is compressed under the limiting force of the oil-sealing nut 3 and the compression of the valve core 2. Simultaneously, the second elastic element 6 is compressed under the limiting force of the valve body 7 and the compression of the spring-locking nut 4.

[0030] Reset Process (Drive Signal Withdrawal): When the drive signal is withdrawn, the drive component 5 retracts, and the first elastic component 1 and the second elastic component 6, which are in a compressed state, simultaneously release their stored elastic potential energy. During the reset process, the restoring forces of the first elastic component 1 and the second elastic component 6 are superimposed, increasing the total reset force of the valve core 2, thereby driving the valve core 2 to return to the neutral position quickly and reliably. This aims to effectively overcome the frictional resistance and adsorption force caused by contaminants (such as particles and sludge) in the high-pressure oil adhering to the gap between the valve core 2 and the valve body 7, thereby reducing the risk of the valve core 2 sticking or even jamming due to insufficient reset force.

[0031] Example 2: Based on Example 1 above, in this example, as follows... Figure 1 As shown, the first elastic element 1 includes a first spring seat 11 and a first spring 12; the first spring seat 11 is disposed at one end of the valve core 2 near the oil sealing nut 3; the two ends of the first spring 12 are respectively connected to the first spring seat 11 and the oil sealing nut 3.

[0032] For example, in implementation, the first elastic element 1 includes a first spring seat 11 and a first spring 12.

[0033] The first spring seat 11 is connected to the end of the valve core 2 near the oil sealing nut 3 by means of welding, screwing, or bonding.

[0034] The first spring 12 is disposed between the first spring seat 11 and the oil seal nut. One end of the first spring 12 is connected to the oil seal nut by welding, screwing, or other methods, and the other end of the first spring 12 is connected to the first spring seat 11 by welding, screwing, or other methods. In use, the force of the first spring 12 acts on the first spring seat 11. The first spring seat 11 acts as a force transition and dispersion element, evenly transmitting the force to the connection part of the valve core 2. This aims to reduce the risk of deformation, wear, or damage to the end of the valve core 2 due to stress concentration during high-frequency, high-load reciprocating motion, thereby effectively extending the service life of the valve core 2.

[0035] Example 3: Based on Example 1 above, in this example, as follows... Figure 1 As shown, the proportional control directional valve also includes a valve sleeve 8; the valve sleeve 8 is disposed inside the valve body 7; the valve core 2 passes through the valve sleeve 8, and one end of the valve sleeve 8 near the drive member 5 is connected to the second elastic member 6.

[0036] For example, in implementation, the proportional control directional valve also includes a valve sleeve 8. The valve sleeve 8 is fixedly installed inside the valve body 7 by means of interference fit, welding, or threading. The valve sleeve 8 can be made of a material that is more wear-resistant, more corrosion-resistant, and easier to precision machine and heat treat than the valve body 7 (such as stainless steel, special alloys, or surface-hardened steel) to ensure that the valve sleeve 8 can withstand higher pressures.

[0037] The valve core 2 is inserted into the valve sleeve 8, and a precise sliding fit (very small clearance) is formed between the valve core 2 and the valve sleeve 8. This is intended to ensure the straightness and sealing of the valve core 2's movement, thereby significantly improving the guiding accuracy and stability of the valve core 2's movement, reducing leakage, and enhancing control precision. Furthermore, when the inner bore of the valve sleeve 8 experiences excessive clearance and increased leakage due to long-term wear, the valve sleeve 8 can be replaced separately without scrapping the entire valve body 7. This aims to reduce maintenance costs.

[0038] One end of the second elastic element 6 is connected to the driving element 5, and the other end of the second elastic element 6 is connected to the valve sleeve 8.

[0039] In the specific implementation process, the driving process (applying a driving signal) is as follows: When the driving component 5 (electromagnet) is working, the driving component 5 pushes the spring-locking nut 4 and the valve core 2, moving them towards the oil-sealing nut 3. At this time, the first elastic element 1 is compressed under the limiting force of the oil-sealing nut 3 and the pressure of the valve core 2. Simultaneously, the second elastic element 6 is compressed under the limiting force of the valve body 7 and the pressure of the spring-locking nut 4.

[0040] Example 4: Based on Example 3 above, in this example, as... Figure 1 As shown, the valve sleeve 8 has an oil passage hole 9; the oil passage holes 9 are symmetrically distributed on the valve sleeve 8.

[0041] For example, during implementation, multiple oil passage holes 9 are formed on the wall of the valve sleeve 8. The oil passage holes 9 can be circular, elliptical, or other shapes, depending on the fluid dynamics requirements. The oil passage holes 9 are symmetrically distributed around the valve sleeve 8, ensuring that the impact of high-pressure oil on the valve core 2 is symmetrical and balanced during flow. This aims to reduce the risk of valve core 2 vibrating and deforming under the impact of high-pressure oil, thereby improving the control accuracy of the proportional control directional valve and extending its service life. Simultaneously, the symmetrically distributed oil passage holes 9 allow the high-pressure oil to flow more uniformly within the valve sleeve 8, aiming to reduce turbulence and localized high-pressure areas, thereby reducing energy loss and improving system efficiency.

[0042] Example 5: Based on Example 3 above, in this example, as follows... Figure 1As shown, the second elastic element 6 includes a second spring seat 61 and a second spring 62; the second spring seat 61 is sleeved on the connecting shaft of the driving element 5 and is connected to the valve sleeve 8; the second spring 62 is sleeved on the connecting shaft of the driving element 5 and its two ends are respectively connected to the second spring seat 61 and the spring locking nut 4.

[0043] For example, in implementation, the second elastic element 6 includes a second spring seat 61 and a second spring 62. The second spring seat 61 is sleeved on the connecting shaft of the driving element 5, and the second spring seat 61 is connected to the end of the valve sleeve 8 near the driving element 5 by means of screw fixing, welding fixing, etc.

[0044] The second spring 62 is sleeved on the connecting shaft of the drive component 5, and one end of the second spring 62 is connected to the second spring seat 61 by welding, screwing, or other means, while the other end of the second spring 62 is connected to the spring locking nut 4 by welding, screwing, or other means. The second spring seat 61 distributes the concentrated load of the second spring 62 to a larger connection area with the valve sleeve 8, in order to reduce the stress level at the connection point of the valve sleeve 8, thereby reducing the risk of damage to the valve sleeve 8 due to fatigue at the connection point.

[0045] Example 6: Based on Example 1 above, in this example, as follows... Figure 1 As shown, the driving component 5 is a linear stepper motor with a closed-loop absolute encoder.

[0046] For example, in the implementation process, the aforementioned drive component 5 is a linear stepper motor with a closed-loop absolute encoder.

[0047] On the one hand, unlike products on the market that use electromagnets, proportional electromagnets, and ordinary stepper motors as power sources, the proportional control directional valve in this embodiment has a greater driving force and can achieve higher closed-loop control accuracy. Furthermore, the proportional control directional valve in this embodiment has a greater driving force and a power-off retention function.

[0048] On the other hand, products on the market that use ordinary stepper motors as power sources have complex structures and require complex manufacturing processes due to the fact that ordinary stepper motors operate in a rotary state, necessitating the design of power conversion mechanisms such as worm gear mechanisms. Furthermore, the cumulative errors caused by various components are detrimental to proportional control accuracy. In contrast, the proportional control directional valve in this embodiment directly uses a linear motor, which has a simpler structure and reduces the cumulative errors of the conversion mechanism. Moreover, compared to ordinary stepper motors, the proportional control directional valve in this embodiment does not require conversion calculations for the conversion mechanism during closed-loop control, effectively improving control accuracy.

[0049] In one optional implementation, the proportional control directional valve in this embodiment integrates an absolute encoder and has a reserved standard interface. This aims to facilitate direct programmable control without requiring hardware redesign, thereby improving the versatility of the proportional control directional valve.

[0050] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A proportional control directional valve, characterized in that, include: The first elastic element (1) has two ends connected to the valve core (2) and the oil sealing nut (3), respectively. A spring locking nut (4) is provided between the valve core (2) and the drive member (5), and the spring locking nut (4) is sleeved on the connecting shaft of the drive member (5); The second elastic element (6) is disposed at the end of the spring locking nut (4) away from the driving element (5), and the two ends of the second elastic element (6) are respectively connected to the valve body (7) and the spring locking nut (4).

2. The proportional control directional valve according to claim 1, characterized in that: The first elastic element (1) includes a first spring seat (11) and a first spring (12); The first spring seat (11) is disposed at one end of the valve core (2) near the oil sealing nut (3); The two ends of the first spring (12) are respectively connected to the first spring seat (11) and the oil sealing nut (3).

3. The proportional control directional valve according to claim 1, characterized in that: It also includes the valve sleeve (8); The valve sleeve (8) is disposed inside the valve body (7); The valve core (2) is inserted inside the valve sleeve (8), and the end of the valve sleeve (8) near the drive member (5) is connected to the second elastic member (6).

4. The proportional control directional valve according to claim 3, characterized in that: The valve sleeve (8) is provided with an oil passage hole (9); The oil passage holes (9) are symmetrically distributed on the valve sleeve (8).

5. The proportional control directional valve according to claim 3, characterized in that: The second elastic element (6) includes a second spring seat (61) and a second spring (62); The second spring seat (61) is sleeved on the connecting shaft of the drive member (5), and the second spring seat (61) is connected to the valve sleeve (8); The second spring (62) is sleeved on the connecting shaft of the drive member (5), and the two ends of the second spring (62) are respectively connected to the second spring seat (61) and the spring locking nut (4).

6. The proportional control directional valve according to claim 1, characterized in that: The drive unit (5) is a linear stepper motor with a closed-loop absolute encoder.

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