Proportional overflow valve

Abstract

The utility model provides a proportional overflow valve, which belongs to the technical field of overflow valves and comprises a main valve core, the main valve core comprises a valve core seat and an inner core, the valve core seat is provided with a through hole, the inner core is provided with a first damping hole, an inlet of the first damping hole is positioned on the peripheral surface of the inner core, and the inner core is mounted in the through hole; the through hole comprises an inlet section and a sealing section which are sequentially arranged in the axial direction of the through hole, the hole wall face of the sealing section and the outer circumferential face of the inner core are attached and sealed, a filtering gap cavity is formed between the hole wall face of the inlet section and the outer circumferential face of the inner core, and an inlet of the first damping hole communicates with the filtering gap cavity. The gap size of the filtering gap cavity is smaller than the diameter of the thinnest part of the first damping hole; the valve element has the advantages that the filtering gap cavity is reserved between the valve element seat and the inner element, oil liquid needs to sequentially pass through the filtering gap cavity and the first damping hole before entering the valve cavity, the filtering gap cavity can prevent large-particle impurities in the oil liquid from entering the first damping hole, and therefore it is guaranteed that the first damping hole cannot be blocked.

Description

Technical Field

[0001] The utility model belongs to the technical field of overflow valves and relates to a proportional overflow valve. Background Art

[0002] The pilot-operated proportional relief valve is a special hydraulic component used to precisely control the pressure of a hydraulic system. It combines the advantages of a conventional pilot-operated relief valve with proportional control technology. It can linearly adjust the output pressure based on an external electrical signal (usually a proportional signal from a controller), thereby achieving continuous and precise control of the hydraulic system pressure.

[0003] A pilot-operated proportional relief valve primarily consists of a pilot valve and a main valve. The pilot valve is a small, direct-acting relief valve, while the main valve is the larger valve responsible for the actual relief operation. The two are hydraulically connected and work together to control system pressure. The pilot valve is equipped with a proportional solenoid, which adjusts the magnetic force generated according to the strength of the signal, thereby controlling the opening threshold of the pilot valve core. When the input electrical signal indicates a need to increase system pressure, the proportional solenoid increases its magnetic force, increasing the pressure required to open the pilot valve. This increases the main valve's opening pressure point, raising the system pressure. Conversely, if the system pressure needs to be reduced, the proportional solenoid reduces its magnetic force, reducing the pressure required to open the pilot valve. This causes the main valve to open at a lower pressure, lowering the system pressure.

[0004] In the above structure, the main valve core generally has a damping hole. The oil at the oil inlet acts on the pilot valve core after passing through the damping hole behind the main valve core. If there are particles in the oil, it is easy to block the damping hole and cause the overflow valve to fail, so there is room for improvement. Utility Model Content

[0005] The purpose of the utility model is to propose a proportional relief valve in view of the above problems existing in the prior art.

[0006] The purpose of the utility model can be achieved through the following technical solutions: A proportional overflow valve, comprising: a main valve core, the main valve core comprising a valve core seat and an inner core, the valve core seat being provided with a through hole, the inner core being provided with a first damping hole, the inlet of the first damping hole being located on the outer peripheral surface of the inner core, the inner core being installed in the through hole, the through hole comprising an inlet section and a sealing section arranged in sequence along its axial direction, the hole wall surface of the sealing section being fitted and sealed with the outer peripheral surface of the inner core, a filter gap cavity being formed between the hole wall surface of the inlet section and the outer peripheral surface of the inner core, the inlet of the first damping hole being connected with the filter gap cavity, and the gap size of the filter gap cavity being smaller than the diameter of the thinnest part of the first damping hole.

[0007] Preferably, the invention further comprises: a valve sleeve, wherein the valve sleeve is configured as a tubular structure, one end of the valve sleeve is configured as an oil inlet, a side wall portion of the valve sleeve is provided with an oil return port, the main valve core is movably mounted in the valve sleeve, the stroke position of the main valve core determines the open and closed state of the fluid passage between the oil inlet and the oil return port, and the inlet of the filter gap cavity is communicated with the oil inlet;

[0008] a pilot valve seat, the pilot valve seat being mounted on the other port of the valve sleeve; a portion of the valve sleeve between the pilot valve seat and the main valve core forming a valve cavity; an outlet of the first damping hole being in communication with the valve cavity; a spring being disposed in the valve cavity; one end of the spring being in contact with the pilot valve seat and the other end being in contact with the valve core seat; a pilot valve hole being defined in the pilot valve seat; an inlet of the pilot valve hole being in communication with the valve cavity;

[0009] a pilot valve core, the pilot valve core being movably mounted at the outlet of the pilot valve hole;

[0010] A proportional electromagnet, a push rod of the proportional electromagnet is connected to the pilot valve core, and the thrust exerted by the proportional electromagnet on the pilot valve core through the push rod determines the opening threshold of the pilot valve core.

[0011] Preferably, an oil drain hole is provided on the wall of the pilot valve seat, one port of the oil drain hole is located on the outer peripheral surface of the pilot valve seat and the other port is located on the hole wall surface at the outlet of the pilot valve hole. When the pressure in the valve cavity is less than the opening threshold of the pilot valve core, the pilot valve core seals the liquid flow channel between the pilot valve hole inlet and the oil drain hole.

[0012] Preferably, the proportional electromagnet is provided with a mounting port, the valve sleeve is connected to the mounting port, an oil drain cavity is formed between the outer peripheral surface of the valve sleeve and the hole wall surface of the mounting port, and one end of the oil drain hole is connected to the oil drain cavity.

[0013] Preferably, the proportional electromagnet is provided with a side hole, one end of the side hole is communicated with the oil drain chamber and the other end is located on the outer peripheral surface of the proportional electromagnet.

[0014] Preferably, a second damping hole is defined in the pilot valve seat, and the second damping hole is communicated with the inlet of the pilot valve hole.

[0015] Preferably, the sealing section is configured as a tapered hole structure, and the outer peripheral surface of the portion of the inner core located in the sealing section is configured as a tapered surface structure, and the tapered surface structure fits and seals with the tapered hole structure.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. A filter gap cavity is reserved between the valve core seat and the inner core. The oil needs to pass through the filter gap cavity and the first damping hole in sequence before entering the valve cavity. The filter gap cavity can prevent large particles of impurities in the oil from entering the first damping hole, thereby ensuring that the first damping hole will not be blocked.

[0018] 2. The sealing section is set to a tapered hole structure, and the outer peripheral surface of the inner core located in the sealing section is set to a tapered surface structure. The tapered surface structure and the tapered hole structure fit tightly and seal, ensuring extremely high sealing performance and preventing the fluid from leaking directly into the valve cavity from the gap between the sealing section and the inner core.

[0019] 3. The first damping hole controls the pressure changes of the system by limiting the speed of fluid flow, providing a stable damping effect, making the system more stable when facing rapid pressure changes, and avoiding overreaction or slow reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the internal structure of the main valve core of the utility model.

[0021] Figure 2 for Figure 1 A magnified schematic diagram of part A.

[0022] Figure 3 This is a schematic diagram of the internal structure of the proportional relief valve of the utility model.

[0023] Figure 4 This is a structural exploded view of the proportional relief valve of the present utility model.

[0024] Figure 5 It is an axonometric view of the proportional relief valve of the present utility model.

[0025] In the figure, 100, main valve core; 110, valve core seat; 120, inner core; 130, through hole; 131, inlet section; 132, sealing section; 140, first damping hole; 150, filter gap cavity; 200, valve sleeve; 210, oil inlet; 220, oil return port; 230, valve cavity; 240, spring; 300, pilot valve seat; 310, oil drain hole; 320, second damping hole; 330, pilot valve hole; 400, pilot valve core; 500, proportional solenoid; 510, installation port; 520, side hole. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0027] like Figure 1-3As shown, a proportional relief valve comprises: a main valve core 100, the main valve core 100 comprises a valve core seat 110 and an inner core 120, the valve core seat 110 is provided with a through hole 130, the inner core 120 is provided with a first damping hole 140, the inlet of the first damping hole 140 is located on the outer peripheral surface of the inner core 120, the inner core 120 is installed in the through hole 130, the through hole 130 comprises an inlet section 131 and a sealing section 132 arranged in sequence along its axial direction, the hole wall surface of the sealing section 132 is sealed with the outer peripheral surface of the inner core 120, a filter gap cavity 150 is formed between the hole wall surface of the inlet section 131 and the outer peripheral surface of the inner core 120, the inlet of the first damping hole 140 is connected with the filter gap cavity 150, and the gap size of the filter gap cavity 150 is smaller than the diameter of the thinnest part of the first damping hole 140.

[0028] The main valve core 100 is designed as a valve core seat 110 and an inner core 120 installed in a through hole 130 of the valve core seat 110. The inner core 120 moves together with the valve core seat 110. The through hole 130 in the valve core seat 110 includes an inlet section 131 and a sealing section 132 along its axial direction. The inlet section 131 is the portion of the through hole 130 that faces the oil inlet 210. The sealing section 132 is used to ensure a sealing surface between the valve core seat 110 and the inner core 120. This design ensures that when oil from the oil inlet 210 acts on the main valve core 100, the oil must pass through the filter gap cavity 150 before entering the first damping orifice 140.

[0029] Preferably, the sealing section 132 is configured as a tapered hole structure, and the outer circumferential surface of the portion of the inner core 120 located within the sealing section 132 is configured as a tapered surface structure, with the tapered surface structure and the tapered hole structure being in close contact and sealed. The close contact between the tapered hole and the tapered surface achieves a high degree of sealing performance, preventing fluid from leaking directly into the valve chamber 230 through the gap between the sealing section 132 and the inner core 120.

[0030] The filter gap cavity 150 is formed between the hole wall surface of the inlet section 131 and the outer peripheral surface of the inner core 120, and is used to filter large particles of impurities in the fluid. The gap size of the filter gap cavity 150 is designed to be smaller than the diameter of the thinnest part of the first damping hole 140, so that impurities can be intercepted more effectively and these large particles of impurities can be prevented from entering the first damping hole 140 and causing blockage. The particle size of impurities that can pass through the filter gap cavity 150 is smaller and cannot cause blockage of the first damping hole 140.

[0031] A filter gap cavity 150 is reserved between the valve core seat 110 and the inner core 120. Before the oil enters the valve cavity 230, it needs to pass through the filter gap cavity 150 and the first damping hole 140 in sequence. The filter gap cavity 150 can prevent large particles of impurities in the oil from entering the first damping hole 140, thereby ensuring that the first damping hole 140 will not be blocked.

[0032] like Figure 1-5As shown, on the basis of the above embodiment, the proportional relief valve further includes: a valve sleeve 200, which is configured as a tubular structure, one port of the valve sleeve 200 is configured as an oil inlet 210, a side wall portion of the valve sleeve 200 is provided with an oil return port 220, a main valve core 100 is movably installed in the valve sleeve 200, a stroke position of the main valve core 100 determines the on-off of the fluid channel between the oil inlet 210 and the oil return port 220, and an inlet of the filter gap cavity 150 is connected to the oil inlet 210; a pilot valve seat 300, which is installed at the other port of the valve sleeve 200, and a portion of the valve sleeve 200 between the pilot valve seat 300 and the main valve core 100 forms a valve cavity 230, the outlet of the first damping hole 140 is connected to the valve chamber 230, and a spring 240 is arranged in the valve chamber 230, one end of the spring 240 is in contact with the pilot valve seat 300 and the other end is in contact with the valve core seat 110, the pilot valve seat 300 is provided with a pilot valve hole 330, and the inlet of the pilot valve hole 330 is connected to the valve chamber 230; the pilot valve core 400, the pilot valve core 400 is movably installed at the outlet of the pilot valve hole 330; the proportional solenoid 500, the push rod of the proportional solenoid 500 is connected to the pilot valve core 400, and the thrust applied by the proportional solenoid 500 to the pilot valve core 400 through the push rod determines the opening threshold of the pilot valve core 400.

[0033] The valve sleeve 200 serves as the outer shell of the entire valve, providing an inlet and outlet channel for the fluid. The main valve core 100 is movably installed in the valve sleeve 200. The outer peripheral surface of the valve core seat 110 of the main valve core 100 can seal the return oil port 220 located on the side wall of the valve sleeve 200, thereby blocking the fluid channel between the oil inlet 210 and the oil return port 220, and the main valve core 100 can open the oil return port 220 by moving, so that the oil inlet 210 and the oil return port 220 are connected.

[0034] The valve cavity 230 and the oil inlet 210 are respectively located on both sides of the main valve core 100, that is, the two sides of the main valve core 100 are respectively subjected to the pressure of the oil inlet 210 and the pressure in the valve cavity 230. Since the outlet of the first damping hole 140 is connected to the valve cavity 230, the pressure of the valve cavity 230 is connected to the pressure of the oil inlet 210. When the pressure in the valve cavity 230 is relieved, the main valve core 100 moves under the action of the pressure of the oil inlet 210, thereby opening the oil return port 220. The spring 240 in the valve cavity 230 causes the main valve core 100 to have a movement tendency to seal the return oil port 220. The pilot valve seat 300 is provided with a pilot valve hole 330. The push rod of the proportional solenoid 500 applies a thrust to the pilot valve hole 330, thereby causing the pilot valve core 400 to block the pilot valve hole 330 and close the valve cavity 230. When the pressure in the valve cavity 230 exceeds the thrust applied by the proportional solenoid 500, the pilot valve core 400 opens. At this time, the pressure in the valve cavity 230 decreases, thereby causing the main valve core 100 to move and open the return oil port 220.

[0035] The working principle of this proportional relief valve is: the oil in the oil inlet 210 enters the valve chamber 230 after passing through the filter gap cavity 150 and the first damping hole 140. Under normal circumstances, the pilot valve core 400 firmly seals the pilot valve hole 330 under the thrust of the proportional solenoid 500 push rod, so that the oil in the valve chamber 230 cannot be discharged through the pilot valve hole 330. Since the pressure in the valve chamber 230 is equal to the pressure of the oil inlet 210 at this time, the main valve core 100 seals the oil return port 220 under the action of the spring 240. When the pressure in the oil inlet 210 increases to the opening threshold of the pilot valve core 400, the pressure in the valve cavity 230 increases accordingly and causes the pilot valve core 400 to overcome the force of the push rod of the proportional solenoid 500 to open the outlet of the pilot valve hole 330, and the oil in the valve cavity 230 flows back to the oil tank through the outlet of the pilot valve core 400. At this time, the pressure in the valve cavity 230 decreases, and there is a pressure difference between the oil inlet 210 and the valve cavity 230. Driven by the pressure difference, the main valve core 100 moves to open the oil return port 220, and the oil in the oil inlet 210 flows back to the oil tank from the oil return port 220, thereby reducing the pressure of the oil inlet 210 and ultimately achieving the purpose of pressure protection.

[0036] On the basis of the above embodiment, an oil drain hole 310 is opened on the wall of the pilot valve seat 300, one port of the oil drain hole 310 is located on the outer peripheral surface of the pilot valve seat 300 and the other port is located on the hole wall surface at the outlet of the pilot valve hole 330. When the pressure in the valve cavity 230 is less than the opening threshold of the pilot valve core 400, the pilot valve core 400 seals the liquid flow channel between the inlet of the pilot valve hole 330 and the oil drain hole 310.

[0037] When the pressure of the oil inlet 210 is greater than the opening threshold of the pilot valve core 400 , the pilot valve core 400 opens the outlet of the pilot valve hole 330 , and the oil in the valve cavity 230 flows into the oil drain hole 310 from the pilot valve hole 330 .

[0038] Based on the above embodiment, the proportional electromagnet 500 is provided with a mounting port 510, the valve sleeve 200 is connected to the mounting port 510, an oil drain cavity is formed between the outer peripheral surface of the valve sleeve 200 and the hole wall surface of the mounting port 510, and one end of the oil drain hole 310 is connected to the oil drain cavity.

[0039] On the basis of the above embodiment, the proportional electromagnet 500 is provided with a side hole 520 , one end of the side hole 520 is communicated with the oil drain chamber and the other end is located on the outer peripheral surface of the proportional electromagnet 500 .

[0040] The oil can be discharged from the oil drain hole 310 into the oil drain chamber and then flow back into the oil tank through the side hole 520. This design ensures that the pressure in the valve chamber 230 can be released quickly, making the system more stable when the pressure changes and reducing oscillation and fluctuation.

[0041] On the basis of the above embodiment, a second damping hole 320 is defined in the pilot valve seat 300 , and the second damping hole 320 is communicated with the inlet of the pilot valve hole 330 .

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In addition, terms such as "first," "second," and "an" in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0044] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0045] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

Claims

1. A proportional relief valve, characterized in that: include: A main valve core (100), the main valve core (100) includes a valve core seat (110) and an inner core (120), the valve core seat (110) is provided with a through hole (130), the inner core (120) is provided with a first damping hole (140), the inlet of the first damping hole (140) is located on the outer peripheral surface of the inner core (120), the inner core (120) is installed in the through hole (130), and the through hole (130) includes inlet sections arranged in sequence along its axial direction (131) and a sealing section (132), the hole wall surface of the sealing section (132) is sealed with the outer peripheral surface of the inner core (120), a filter gap cavity (150) is formed between the hole wall surface of the inlet section (131) and the outer peripheral surface of the inner core (120), the inlet of the first damping hole (140) is connected to the filter gap cavity (150), and the gap size of the filter gap cavity (150) is smaller than the diameter of the thinnest part of the first damping hole (140).

2. A proportional relief valve according to claim 1, characterized in that: Also includes: A valve sleeve (200), wherein the valve sleeve (200) is configured as a tubular structure, one end of the valve sleeve (200) is configured as an oil inlet (210), a side wall portion of the valve sleeve (200) is provided with an oil return port (220), the main valve core (100) is movably mounted in the valve sleeve (200), the stroke position of the main valve core (100) determines the opening and closing of the fluid channel between the oil inlet (210) and the oil return port (220), and the inlet of the filter gap cavity (150) is communicated with the oil inlet (210); A pilot valve seat (300), the pilot valve seat (300) is installed at the other end of the valve sleeve (200), a portion of the valve sleeve (200) between the pilot valve seat (300) and the main valve core (100) forms a valve cavity (230), the outlet of the first damping hole (140) is communicated with the valve cavity (230), a spring (240) is provided in the valve cavity (230), one end of the spring (240) is in contact with the pilot valve seat (300) and the other end is in contact with the valve core seat (110), the pilot valve seat (300) is provided with a pilot valve hole (330), the inlet of the pilot valve hole (330) is communicated with the valve cavity (230); a pilot valve core (400), the pilot valve core (400) being movably mounted at the outlet of the pilot valve hole (330); A proportional electromagnet (500) having a push rod connected to the pilot valve core (400) and a thrust force applied by the proportional electromagnet (500) to the pilot valve core (400) via the push rod determines an opening threshold of the pilot valve core (400).

3. A proportional relief valve according to claim 2, characterized in that: An oil drain hole (310) is provided on the wall of the pilot valve seat (300), one end of the oil drain hole (310) is located on the outer peripheral surface of the pilot valve seat (300) and the other end is located on the hole wall surface at the outlet of the pilot valve hole (330). When the pressure in the valve cavity (230) is lower than the opening threshold of the pilot valve core (400), the pilot valve core (400) seals the liquid flow path between the inlet of the pilot valve hole (330) and the oil drain hole (310).

4. A proportional relief valve according to claim 3, characterized in that: The proportional electromagnet (500) is provided with a mounting port (510), the valve sleeve (200) is connected to the mounting port (510), an oil drain cavity is formed between the outer peripheral surface of the valve sleeve (200) and the hole wall surface of the mounting port (510), and one end of the oil drain hole (310) is connected to the oil drain cavity.

5. A proportional relief valve according to claim 4, characterized in that: The proportional electromagnet (500) is provided with a side hole (520), one end of the side hole (520) is communicated with the oil drain chamber and the other end is located on the outer peripheral surface of the proportional electromagnet (500).

6. A proportional relief valve according to claim 2, characterized in that: A second damping hole (320) is provided in the pilot valve seat (300), and the second damping hole (320) is communicated with the inlet of the pilot valve hole (330).

7. A proportional relief valve according to claim 1, characterized in that: The sealing section (132) is configured as a tapered hole structure, and the outer peripheral surface of the portion of the inner core (120) located in the sealing section (132) is configured as a tapered surface structure, wherein the tapered surface structure is fitted and sealed with the tapered hole structure.

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