A pilot valve

Abstract

This invention relates to a pilot valve, comprising a valve body, a valve cover, a pilot valve seat, a mechanical iris mechanism, an adjusting assembly, and a sealing assembly. The mechanical iris mechanism includes a grooved wheel, a slide rail, a flat key, a rotating shaft, an opening screw, a pilot valve cone core, and two sets of sliders. The adjusting assembly includes an adjusting nut, an adjusting rod, a first-position spring, and a second-position spring. In the first position, the pre-compression of the first-position spring is adjusted by the adjusting nut in the adjusting assembly, thereby setting the set pressure. In the second position, after the pilot valve resets, rotating the opening screw causes the rotating shaft to rotate, causing the two sets of sliders to extend outwards. The extended parts of the sliders abut against the lower end of the second-position spring in the adjusting assembly. At this time, the set pressure is determined by the pre-compression of the first and second-position springs, realizing multi-position pressure setting of the pilot valve. This invention applies a mechanical iris mechanism to the pilot valve structure, effectively expanding the set pressure range of the pilot valve, allowing the pilot valve to be applied to hydraulic systems of different pressure levels.

Description

Technical Field

[0001] This invention relates to the field of hydraulic valve technology, and in particular to a pilot valve. Background Technology

[0002] Pressure control valves are pressure control components in hydraulic systems. They can be categorized into relief valves, sequence valves, and pressure reducing valves, playing a crucial role in stabilizing pressure, ensuring safe operation, and controlling the sequence of actions of actuators in hydraulic systems. Pressure control valves are classified into direct-acting and pilot-operated types. The set pressure of a direct-acting pressure control valve is determined by the main valve spring and is primarily used in low-pressure systems. To meet the needs of medium- and high-pressure hydraulic systems, pilot-operated pressure control valves are formed by combining pilot valves with direct-acting valves.

[0003] Traditional pressure control valves mainly consist of a valve body, a valve core, and a spring, thus limiting the valve's set pressure range. Different pressure control valves are required for different pressure levels. To meet the demands of green manufacturing technologies, the applicability of traditional pressure control valves should be enhanced, and pilot valves capable of adapting to different pressure systems should be designed. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing pilot valves by providing a pilot valve with a gear adjustment function, enabling multiple gear applications with a single valve and expanding the applicability of pilot valves. The technical problem to be solved by this invention is achieved through the following technical solution.

[0005] A pilot valve with gear adjustment function is composed of a valve body, a valve cover, a pilot valve seat, a mechanical iris mechanism, an adjustment component, and a sealing component.

[0006] The valve body has a threaded hole inside, and the pilot valve is connected and fixed to the main valve to be used with it by bolts; the mechanical iris mechanism assembly and the pilot valve seat are respectively installed along the axis inside the valve body; the valve body has a threaded hole at the end, and the valve cover is connected to it by hex bolts; and the valve body has an oil passage inside that communicates with the main valve to be used with it.

[0007] The valve cover has a threaded hole at the bottom and is connected to the valve body by a hexagonal bolt; the valve body is equipped with an adjustment component along the axial direction; the upper outer surface of the valve cover is threaded.

[0008] The mechanical iris mechanism in the pilot valve comprises a grooved wheel, a slide rail, a key, a rotating shaft, a pre-drilled screw, a pilot valve cone core, and two sets of sliders. The rotating shaft and the grooved wheel are connected by a key; the end of the rotating shaft and the front end of the pilot valve cone core are respectively threaded with external and internal threads, and the end of the rotating shaft and the pilot valve cone core are connected by threads; the front end of the rotating shaft and the end of the pre-drilled screw are respectively threaded with external and internal threads, and the front end of the rotating shaft is connected to the pre-drilled screw by threads; the two sets of sliders are placed in the slide rail, and the upper surface of the sliders is provided with protrusions; the grooved wheel has grooves inside that mate with the protrusions; when the rotating shaft is rotated by the pre-drilled screw, the grooved wheel rotates accordingly, and the protrusions on the upper surface of the sliders are forced to slide within the grooves of the grooved wheel, thereby causing the two sets of sliders to move within the slide rail, extending outwards or retracting inwards.

[0009] The adjusting assembly of the pilot valve includes an adjusting nut, an adjusting rod, a first-position spring, and a second-position spring. The top end of the adjusting rod is placed inside the adjusting nut and is fixedly connected to the adjusting nut with an interference fit. The end of the adjusting nut has an internal thread, which connects to the valve cover to fix the adjusting assembly on the valve cover, and places the first and second-position springs in the spring cavity of the valve cover. The outer surface of the adjusting rod has bosses that respectively mate with the first-position spring and the second-position spring, and the adjusting rod is connected to the first-position spring and the second-position spring respectively through the two bosses. The inner surface of the adjusting nut has an internal thread, which is threaded to the upper outer surface of the valve cover.

[0010] The pilot valve sealing assembly includes two O-rings and a rear screw cap. The rear screw cap has external threads along the axial direction and is threaded to the valve body.

[0011] The adjusting nut and adjusting rod in the adjusting assembly have through holes along the axis. The rotating shaft in the mechanical iris mechanism is placed in the through hole and is threadedly connected to the opening screw in the mechanical iris mechanism assembly at the top. The outer diameter of the opening screw is clearance-fitted with the through hole and rotating shaft of the adjusting nut and adjusting rod. The rotating shaft can rotate and slide along the through hole.

[0012] When the end of the first-position spring in the adjusting assembly is installed, it is compressed on the upper surface of the mechanical iris mechanism assembly, fixing the mechanical iris mechanism in the valve body and ensuring that the pilot valve cone core is tightly pressed against the pilot valve seat, thereby blocking the flow of liquid. The pre-compression of the first-position spring is adjusted by the adjusting nut in the adjusting assembly, thus setting the set pressure at this time. When the liquid pressure inside the valve exceeds the set pressure of the first position of the pilot valve, the slide rail in the mechanical iris mechanism assembly is pushed open, and the liquid in the pilot valve cavity begins to flow, realizing pressure control of the hydraulic system.

[0013] Rotating the hole screw of the mechanical iris mechanism causes the rotating shaft to rotate accordingly; the protrusion on the upper surface of the slider of the mechanical iris mechanism component is forced to slide in the groove of the grooved wheel, thereby driving the slider to extend outward along the slide rail; the extended part of the slider will abut against the lower end of the second spring in the adjustment component, at which time the setting pressure is related to the pre-compression of the first and second springs, thereby realizing the adjustment of the pilot valve position.

[0014] The beneficial effects of this invention are:

[0015] The pilot valve of this invention adopts a simple and low-cost mechanical iris mechanism. By setting two springs, the pilot valve position adjustment function is realized, which effectively expands the applicable range of the pilot valve setting pressure, enabling one valve to be used in different hydraulic systems. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the pilot valve in the first position.

[0017] Figure 2 This is a cross-sectional view of the pilot valve in the second position.

[0018] Figure 3 This is a magnified view of the second position of the pilot valve;

[0019] Figure 4 This is a schematic diagram of the mechanical iris recognition mechanism component in its first stage.

[0020] Figure 5 This is a schematic diagram of the mechanical iris recognition mechanism component in its second gear configuration;

[0021] Figure 6 This is a schematic diagram of part of the adjustment component structure;

[0022] In the figure: 1. Pilot valve seat, 2. Valve body, 3. Pilot valve cone core, 4. Grooved wheel, 5. O-ring seal (1), 6. Slide rail, 7. Valve cover, 8. Adjusting nut, 9. Opening screw, 10. Adjusting rod, 11. First spring, 12. Second spring, 13. Rotating shaft, 14. Hex bolt, 15. Slider, 16. Flat key, 17. O-ring seal (2), 18. Rear screw cap. Detailed Implementation

[0023] like Figure 1 , Figure 2 and Figure 3 As shown, a pilot valve with gear adjustment function consists of a valve body 2, a valve cover 7, a pilot valve seat 1, a mechanical iris mechanism composed of a grooved wheel 4, a slide rail 6, a flat key 16, a rotating shaft 13, an opening screw 9, a pilot valve cone valve core 3 and two sets of sliders 15, an adjustment assembly composed of an adjustment nut 8, an adjustment rod 10, a first-gear spring 11 and a second-gear spring 12, and sealing assemblies 5 and 17.

[0024] The valve body 2 has a threaded hole inside, and the pilot valve is connected and fixed to the main valve to be used with it by bolts; the mechanical iris mechanism assembly and the pilot valve seat 1 are respectively installed along the axis inside the valve body 2; the valve body 2 has a threaded hole at the end, and the valve cover 7 is connected by hexagonal bolts; and the valve body 2 has an oil passage inside that communicates with the main valve to be used with it.

[0025] The valve cover 7 has a threaded hole at the bottom and is connected to the valve body 2 by a hexagonal bolt; the valve body 2 is placed along the axial direction for the adjustment assembly; the upper outer surface of the valve cover 7 is provided with external threads.

[0026] like Figures 1-5 As shown, the mechanical iris mechanism in the pilot valve comprises a grooved wheel 4, a slide rail 6, a flat key 16, a rotating shaft 13, an opening screw 9, a pilot valve cone valve core 3, and two sets of sliders 15. The rotating shaft 13 and the grooved wheel 4 are connected by a flat key 16; the end of the rotating shaft 13 and the front end of the pilot valve cone valve core 3 are respectively threaded with external and internal threads, and the end of the rotating shaft 13 and the pilot valve cone valve core 3 are connected by threads; the front end of the rotating shaft 13 and the end of the hole screw 9 are respectively threaded with external and internal threads, and the front end of the rotating shaft 13 is connected to the hole screw 9 by threads; two sets of sliders 15 are placed in the slide rail 6, and the upper surface of the sliders 15 is provided with protrusions; the grooved wheel 4 has a groove inside that mates with the protrusions; when the rotating shaft 13 is rotated by the hole screw 9, the grooved wheel 4 rotates accordingly, and the protrusions on the upper surface of the sliders 15 are forced to slide in the groove of the grooved wheel 4, thereby causing the two sets of sliders 15 to move within the slide rail 6, extending outwards or retracting inwards. Figure 1 , Figure 4 The image shows the two sets of sliders 15 in the unextended state; Figure 2 , Figure 3 and Figure 5 The image shows the two sets of sliders 15 in the extended state.

[0027] like Figure 1 , Figure 2 and Figure 6 As shown, the adjusting assembly of the pilot valve includes an adjusting nut 8, an adjusting rod 10, a first-position spring 11, and a second-position spring 12. The top end of the adjusting rod 10 is placed inside the adjusting nut 8 and is fixedly connected to the adjusting nut 8 by an interference fit; the end of the adjusting nut 8 has an internal thread, which is connected to the valve cover 7 to fix the adjusting assembly on the valve cover 7, and the first-position spring 11 and the second-position spring 12 are placed in the spring cavity of the valve cover 7; the outer surface of the adjusting rod 10 has bosses that respectively cooperate with the first-position spring 11 and the second-position spring 12, and the adjusting rod 10 is connected to the first-position spring 11 and the second-position spring 12 through the two bosses respectively; the inner surface of the adjusting nut 8 has an internal thread, which is threaded to the upper outer surface of the valve cover 7.

[0028] like Figure 1 , Figure 2 As shown, the pilot valve sealing assembly includes two O-rings (1) 5, an O-ring (2) 17, and a rear screw cap 18. The rear screw cap 18 has external threads along the axial direction and is connected to the valve body 2 by threads.

[0029] like Figure 1 , Figure 2 As shown, the adjusting nut 8 and adjusting rod 10 in the adjusting assembly have through holes along the axis. The rotating shaft 13 in the mechanical iris mechanism is placed in the through hole and is threadedly connected to the opening screw 9 in the mechanical iris mechanism assembly at the upper part. The outer diameter of the opening screw 9 is clearance-fitted with the through hole of the adjusting nut 8 and adjusting rod 10 and the rotating shaft 13. The rotating shaft 13 can rotate and slide along the through hole.

[0030] like Figure 1 As shown, when the end of the first-position spring 11 in the adjusting assembly is installed, it is compressed on the upper surface of the mechanical iris mechanism assembly, fixing the mechanical iris mechanism inside the valve body 2 and causing the pilot valve cone core 3 to be tightly pressed against the pilot valve seat 1, thereby blocking the flow of liquid. The pre-compression of the first-position spring 11 is adjusted by the adjusting nut 8 in the adjusting assembly, thereby setting the set pressure at this time. When the liquid pressure inside the valve is greater than the set pressure of the first position of the pilot valve, the slide rail 6 in the mechanical iris mechanism assembly is pushed open, and the liquid in the pilot valve cavity begins to flow, realizing pressure control of the hydraulic system.

[0031] The rotating shaft 13 can be rotated via the perforated screw 9 to position the pilot valve in either the first or second gear. Ignoring friction between the valve core and valve body and hydraulic forces, the first gear setting pressure of the new pilot valve is F1 = k1x 01 / A, the second-level set pressure is F2=(k1+k2)x 02 / A, where k1 and k2 are the first and second spring stiffnesses, respectively; x 01 x 02 A represents the pre-compression of the springs in the first and second gear positions; A represents the pressure-bearing area of ​​the pilot valve core.

[0032] like Figure 1 As shown, when the pilot valve is in position one, the pre-compression of the first-position spring 11 is adjusted by the adjusting nut 8 in the adjusting assembly, thereby setting the set pressure at this time; rotating the adjusting nut 8 in the opposite direction resets the pilot valve, bringing it to its initial state. Rotating the opening screw 9 of the mechanical iris mechanism causes the rotating shaft 13 to rotate accordingly. The protrusion on the upper surface of the slider 15 of the mechanical iris mechanism assembly is forced to slide within the groove of the grooved wheel 4, thereby causing the slider 15 to extend outward along the slide rail 6, as shown. Figure 2 , Figure 3As shown, the extended part of the slider 15 will abut against the lower end of the second spring 12 in the adjustment assembly. At this time, the pilot valve is in the second position, and the setting pressure is jointly adjusted by the first spring 11 and the second spring 12, thereby expanding the adjustment range of the setting pressure.

[0033] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A pilot valve, characterized in that, It consists of a valve body, valve cover, pilot valve seat, mechanical iris mechanism, regulating components and sealing components; The valve body has a threaded hole inside, and the pilot valve is connected and fixed to the main valve to be used with it by bolts; the mechanical iris mechanism and the pilot valve seat are respectively installed along the axis inside the valve body; the valve body has a threaded hole at the end, and the valve cover is connected to it by hexagonal bolts; and the valve body has an oil passage inside that communicates with the main valve to be used with it. The valve cover has a threaded hole at the bottom and is connected to the valve body by a hex bolt; the valve body is equipped with an adjustment component along the axial direction; the upper outer surface of the valve cover is threaded. The mechanical iris recognition mechanism includes a grooved wheel, a slide rail, a flat key, a rotating shaft, a perforated screw, a pilot valve cone core, and two sets of sliders; the pilot valve adjustment assembly includes an adjustment nut, an adjustment rod, a first-position spring, and a second-position spring; the top of the adjustment rod is placed inside the adjustment nut and is fixedly connected to the adjustment nut by an interference fit; the end of the adjustment nut has an internal thread, which is connected to the valve cover to fix the adjustment assembly on the valve cover, and the first-position spring and the second-position spring are placed in the spring cavity of the valve cover; The rotating shaft and the grooved wheel are connected by a flat key; the end of the rotating shaft and the front end of the pilot valve cone core are respectively threaded with external and internal threads, and the end of the rotating shaft and the pilot valve cone core are connected by threads; the front end of the rotating shaft and the end of the hole screw are respectively threaded with external and internal threads, and the front end of the rotating shaft is connected to the hole screw by threads; two sets of sliders are placed in the slide rail, and the upper surface of the sliders is connected with protrusions by threads; the grooved wheel has a groove inside that mates with the protrusions; The adjusting nut and adjusting rod have through holes along the axis; the rotating shaft is placed in the through hole and is connected to the screw with the hole at the top by thread, and the rotating shaft can rotate and slide along the through hole.

2. The pilot valve according to claim 1, characterized in that, The outer surface of the adjusting rod is provided with bosses that cooperate with the first-position spring and the second-position spring, and the adjusting rod is connected to the first-position spring and the second-position spring through the two bosses respectively.

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