Overflow valve

Abstract

The utility model belongs to the technical field of hydraulic valves, and discloses an overflow valve. The overflow valve comprises a valve seat and a valve element. Wherein the valve seat comprises an oil inlet hole and an oil return hole, the oil inlet hole is communicated with the oil return hole through an oil passing channel, an abutting part is arranged on the inner wall of the valve seat, and the abutting part is arranged between the oil inlet hole and the oil return hole; the valve element is movably arranged in the valve seat in the axial direction of the valve seat, an arc-shaped protrusion is arranged in the circumferential direction of the valve element, the diameter of the arc-shaped protrusion is gradually reduced in the direction close to the oil inlet hole, and the arc-shaped protrusion can abut against or be away from the abutting part so as to close or open the oil passing channel. When the overflow valve works, the problems that due to the fact that the instantaneous opening degree of a valve port is too large, the pressure is unstable, and vibration cavitation is large can be solved, and then the good hydraulic effect is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic valve technical field especially relates to a relief valve. BACKGROUND

[0002] In mechanical hydraulic system, to prevent system pressure from being too large and exceeding the limit value, a relief valve is usually installed in the system to ensure that the system will not appear pressure overshoot phenomenon due to excessive pressure, thereby ensuring the stability of operation and protecting the hydraulic equipment. Generally, the valve port opening of the relief valve needs to ensure that the hydraulic pressure on one side of the valve core is greater than the elastic force on the other side, but after the valve port is opened, a great pressure drop will be formed at the valve port, which will cause problems such as unstable pressure and large vibration.

[0003] Therefore, there is an urgent need for a relief valve to solve the above technical problems. INVENTION CONTENTS

[0004] The utility model discloses a relief valve to solve the problem of large instantaneous opening degree of valve port, which can easily lead to unstable pressure and cavitation noise.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] A relief valve comprises:

[0007] A valve seat comprises an oil inlet hole and an oil return hole, and the oil inlet hole and the oil return hole are communicated through an oil passage, and the inner wall of the valve seat is provided with an abutting portion, which is arranged between the oil inlet hole and the oil return hole;

[0008] A valve core is movably arranged in the valve seat along the axial direction of the valve seat, and the valve core is provided with an arc-shaped protrusion in the circumferential direction, the diameter of the arc-shaped protrusion gradually decreases along the direction close to the oil inlet hole, and the arc-shaped protrusion can abut or be away from the abutting portion to close or open the oil passage.

[0009] Preferably, the cross section of the arc-shaped protrusion along the axial direction of the valve seat is in the shape of a wing.

[0010] Preferably, the abutting portion is provided with a slope surface for abutting and sealing cooperation with the arc-shaped protrusion, and the arc-shaped protrusion can abut and seal with the slope surface to close and seal the oil passage.

[0011] Preferably, the valve core comprises a first valve core segment and a second valve core segment connected in sequence, the arc-shaped protrusion is arranged on the outer periphery of the first valve core segment, when the arc-shaped protrusion abuts the abutting portion, the second valve core segment can extend into the oil passage and form an oil passage gap between the oil passage, and the oil passage gap is communicated with the oil inlet hole.

[0012] Preferably, the oil passing gap is annularly arranged between the second valve core segment and the inner wall of the oil passing channel along the axial direction of the second valve core segment.

[0013] Preferably, the overflow valve further comprises an oil passing groove, the oil passing groove is located at the valve seat and / or the second valve core segment, when the oil passing groove is located at the valve seat, the groove wall of the oil passing groove is recessed to the side away from the second valve core segment relative to the inner wall of the valve seat to form the oil passing gap, when the oil passing groove is located at the second valve core segment, the groove wall of the oil passing groove is recessed to the side away from the valve seat relative to the surface of the second valve core segment to form the oil passing gap.

[0014] Preferably, the valve core further comprises a third valve core segment, the third valve core segment is arranged at the end of the second valve core segment away from the first valve core segment, and the third valve core segment is in sliding guide cooperation with the inner wall of the oil passing channel.

[0015] Preferably, the overflow valve further comprises an elastic assembly and an adjusting assembly, the adjusting assembly is arranged at the end of the valve seat away from the oil inlet hole, the adjusting assembly is in screw cooperation with the valve seat, one end of the elastic assembly is in abutment with the adjusting assembly, and the other end is in abutment with the valve core.

[0016] Preferably, the elastic assembly comprises an elastic piece and a spring seat, one end of the elastic piece is connected with or in abutment with the spring seat, and the other end is in abutment with the adjusting assembly, and the side of the spring seat away from the elastic piece is in abutment with the valve core.

[0017] Preferably, the adjusting assembly is provided with a limiting cavity along the axial direction, and the end of the elastic piece away from the spring seat can extend into the limiting cavity and abut to the cavity bottom of the limiting cavity.

[0018] The utility model discloses the beneficial effects of:

[0019] The utility model discloses a kind of overflow valves. The overflow valve includes valve seat and valve core. Wherein valve seat includes oil inlet hole and oil return hole, and oil inlet hole and oil return hole are communicated by oil passing channel, the inner wall of valve seat is provided with abutment part, abutment part is arranged between oil inlet hole and oil return hole;Valve core is movably arranged in valve seat along the axial direction of valve seat, and the circumferential direction of valve core is provided with arc-shaped protrusion, the diameter of arc-shaped protrusion gradually decreases along the direction close to oil inlet hole, and arc-shaped protrusion can abut or be away from abutment part, to close or open oil passing channel.

[0020] When the overflow valve works, hydraulic oil pushes the valve core to move to the inside of the valve seat through the oil inlet hole and the oil passage, at this time, the arc-shaped protrusion of the valve core can be separated from the abutting portion and form an opening, and the structure of the arc-shaped protrusion can reduce the pressure change gradient when the hydraulic oil passes through the opening, thereby ensuring the stability of the flow at the valve port. With the continuous improvement of the stability of the hydraulic oil flow, the vibration and noise generated by the valve port flow can be indirectly reduced, thereby ensuring good hydraulic effect. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a cross-sectional schematic view of the overflow valve provided by the utility model;

[0022] Figure 2 is a cross-sectional schematic view of the overflow valve after removing the valve core provided by the utility model;

[0023] Figure 3 is a cross-sectional view of the valve core of the overflow valve provided by the utility model.

[0024] In the drawings:

[0025] 10, valve seat; 11, oil inlet hole; 12, oil return hole; 13, oil passage; 14, abutting portion; 15, oil passage gap; 16, cavity;

[0026] 20, valve core; 21, arc-shaped protrusion; 22, first valve core section; 23, second valve core section; 24, third valve core section;

[0027] 30, elastic assembly; 31, elastic piece; 32, spring seat;

[0028] 40, adjusting assembly; 41, adjusting rod; 411, limiting cavity; 42, screw sleeve; 43, nut;

[0029] 50, sealing piece. DETAILED DESCRIPTION

[0030] The utility model will be further described in detail below in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0031] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0034] To prevent overshoot in hydraulic systems due to excessive pressure, a relief valve is usually installed. However, when the relief valve is opened, a large pressure drop will instantly form at the valve port, leading to unstable pressure and severe vibration.

[0035] In order to solve the above technical problems, a relief valve is provided in this embodiment, such as Figures 1-3 As shown, the overflow valve includes a valve seat 10 and a valve core 20; the valve seat 10 includes an oil inlet hole 11 and an oil return hole 12, and the oil inlet hole 11 and the oil return hole 12 are connected through an oil passage 13, and an abutment portion 14 is provided on the inner wall of the valve seat 10, and the abutment portion 14 is provided between the oil inlet hole 11 and the oil return hole 12; the valve core 20 is movably provided in the valve seat 10 along the axial direction of the valve seat 10, and an arc-shaped protrusion 21 is provided circumferentially of the valve core 20, and the diameter of the arc-shaped protrusion 21 gradually decreases in the direction approaching the oil inlet hole 11, and the arc-shaped protrusion 21 can abut or move away from the abutment portion 14 to close or open the oil passage 13.

[0036] Due to the arc-shaped protrusion 21 provided on the outer periphery of the valve core 20, the arc-shaped protrusion 21 can abut against the abutment portion 14 of the valve seat 10, the oil enters the oil passage 13 through the oil inlet hole 11, and then the hydraulic oil can push the valve core 20 to ensure the sealing effect of the valve core 20 on the valve seat 10; when the liquid moves along the axial direction of the valve seat 10 to the inside of the valve seat 10, the arc-shaped protrusion 21 is separated from the abutment portion 14, and part of the hydraulic oil can flow back through the oil return hole 12; in this process, the arc-shaped protrusion 21 can reduce the change gradient of the pressure when the hydraulic oil flows, thereby ensuring the stability of the flow at the valve port. In addition, the stability of the flow is continuously improved, which indirectly reduces the vibration and noise generated by the flow at the valve port, thereby improving the use experience.

[0037] It should be pointed out that, as shown in Figure 1 and Figure 2 , the overflow valve further comprises an elastic assembly 30 and an adjusting assembly 40, the adjusting assembly 40 is arranged at the end of the valve seat 10 away from the oil inlet hole 11, the adjusting assembly 40 is in threaded cooperation with the valve seat 10, one end of the elastic assembly 30 abuts against the adjusting assembly 40, and the other end abuts against the valve core 20. In the case where no hydraulic oil is introduced, the elastic force of the elastic assembly 30 can push the valve core 20 and make the arc-shaped protrusion 21 abut against the abutment portion 14 of the valve seat 10, so as to ensure that the valve seat 10 has good sealing effect inside when the overflow valve is not in working state. The adjusting assembly 40 can adjust the pre-tightening force of the elastic assembly 30, thereby improving the application range of the overflow valve and ensuring that it can be applied in many working conditions. In addition, the adjusting assembly 40 is in threaded cooperation with the valve core 20, which facilitates subsequent maintenance and replacement of parts, thereby improving the use convenience.

[0038] Specifically, as shown in Figure 1 , the elastic assembly 30 comprises an elastic piece 31 and a spring seat 32, one end of the elastic piece 31 is connected or abuts against the spring seat 32, the other end abuts against the adjusting assembly 40, and the side of the spring seat 32 away from the elastic piece 31 abuts against the valve core 20. The spring seat 32 is arranged to facilitate the installation of the elastic piece 31, thereby improving the use convenience and stability when the elastic piece 31 is compressed. In addition, in this embodiment, the elastic piece 31 is a spring, which has simple structure and low price, and is conducive to reducing manufacturing cost. In addition, in order to ensure that the hydraulic oil has sufficient pressure to compress the elastic assembly 30, as shown in Figure 1 and Figure 3 , a plurality of oil inlet holes 11 are arranged along the circumferential direction of the oil passage 13, thereby ensuring good hydraulic effect.

[0039] In addition, it should be pointed out that, as shown in Figure 1 and Figure 2As shown, the adjusting assembly 40 comprises an adjusting rod 41, a sleeve 42 and a nut 43, wherein the adjusting rod 41 passes through the sleeve 42 and the nut 43 and is threadedly connected with the sleeve 42 and the nut 43 respectively, the outer periphery of the sleeve 42 is threadedly connected with the valve seat 10 and is fixed by the nut 43, and the inside of the valve seat 10 is provided with the cavity 16. When the pre-tightening force of the elastic member 31 needs to be adjusted, the nut 43 is first loosened, then the adjusting rod 41 is rotated and moved axially into the cavity 16 to a preset position, and then the nut 43 is tightened and fixed. The operation is simple, and the subsequent maintenance and replacement are convenient. In addition, the pre-tightening force of the elastic member 31 can be adjusted for different working conditions.

[0040] On this basis, the adjusting rod 41 in the adjusting assembly 40 is provided with a limiting cavity 411 in the axial direction, and the end of the elastic member 31 away from the spring seat 32 can extend into the limiting cavity 411 and abut against the bottom of the limiting cavity 411. This arrangement can limit and fix the elastic member 31, avoid the elastic member 31 from shaking when the valve core 20 compresses the elastic member 31, and ensure that the elastic member 31 does not move in a direction deviating from the axis of the valve seat 10, thereby ensuring good hydraulic effect. In addition, in order to avoid hydraulic oil leakage, a sealing member 50 is arranged between the adjusting rod 41 and the inner wall of the cavity 16, so that the leakage of hydraulic oil from the gap between the adjusting rod 41 and the cavity 16 is avoided, thereby achieving good hydraulic effect. It should be noted that the sealing member 50 can be any structure such as an O-ring or a sealing ring as long as it can ensure good sealing effect, which is not limited in the embodiment.

[0041] Specifically, as shown in Figure 1 and Figure 3 The cross section of the arc-shaped protrusion 21 in the axial direction of the valve seat 10 is in the shape of a wing. When the arc-shaped protrusion 21 is separated from the abutting portion 14 and forms an opening at the valve port, the protrusion in the shape of a wing can guide the hydraulic oil well and effectively suppress flow separation and form vortex to stabilize the flow at the valve port. When the flow of hydraulic oil at the valve port is stable, the mechanical vibration and noise of the overflow valve can be effectively reduced, thereby ensuring good use effect.

[0042] In addition, in the embodiment, the abutting portion 14 has a slope for abutting and sealing with the arc-shaped protrusion 21, and the arc-shaped protrusion 21 abuts and seals with the slope to close and seal the oil passage 13. By arranging the slope capable of abutting with the arc-shaped protrusion 21, a gradually expanding flow passage can be formed when the valve port is opened, avoiding the valve port from being opened instantaneously, thereby further reducing the variation gradient of pressure and improving the stability of flow. This structure cooperates with the above-mentioned arc-shaped protrusion 21 to minimize mechanical vibration and reduce cavitation noise to the greatest extent. In addition, after the arc-shaped protrusion 21 abuts and fits with the slope 14, good sealing can also be formed, thereby ensuring good hydraulic effect.

[0043] Specifically, as shown in Figure 1 and Figure 2 The valve core 20 includes a first valve core segment 22 and a second valve core segment 23 connected in sequence, and the arc-shaped protrusion 21 is arranged on the outer periphery of the first valve core segment 22. When the arc-shaped protrusion 21 abuts against the abutting portion 14, the second valve core segment 23 can extend into the oil passing channel 13 and form an oil passing gap 15 with the oil passing channel 13, and the oil passing gap 15 is in communication with the oil inlet hole 11. The arc-shaped protrusion 21 can be directly arranged on the first valve core segment 22, which can simplify the overall structure of the valve core 20 and reduce the manufacturing cost. At the same time, since the second valve core segment 23 can extend into the oil passing channel 13 and form the oil passing gap 15 with the oil passing channel 13, when the arc-shaped protrusion 21 of the first valve core segment 22 abuts against the abutting portion 14, the hydraulic oil can still push the valve core 20 through the oil passing gap 15, thereby ensuring the hydraulic effect.

[0044] Specifically, as shown in Figure 1 along the axial direction of the second valve core segment 23, the oil passing gap 15 is arranged in the form of an annular cavity between the second valve core segment 23 and the inner wall of the oil passing channel 13. That is, the diameter of the second valve core segment 23 is smaller than the diameter of the oil passing channel 13, so that after the second valve core segment 23 extends into the oil passing channel 13, the oil passing gap 15 can be naturally formed, thereby simplifying the overall structure and ensuring that the hydraulic oil can flow smoothly in the oil passing gap 15, thereby pushing the valve core 20 to compress the elastic member 31 and complete the hydraulic operation.

[0045] In addition, in other embodiments, the overflow valve further includes an oil passing groove, and the oil passing groove is located in the valve seat 10 and / or the second valve core segment 23. When the oil passing groove is located in the valve seat 10, the groove wall of the oil passing groove is recessed relative to the inner wall of the valve seat 10 to the side away from the second valve core segment 23 to form the oil passing gap 15. When the oil passing groove is located in the second valve core segment 23, the groove wall of the oil passing groove is recessed relative to the surface of the second valve core segment 23 to the side away from the valve seat 10 to form the oil passing gap 15. The oil passing gap 15 is formed by the above structure, which can be a groove extending along the axial direction of the valve core 20 or an annular gap. Regardless of which structure, it can ensure that the hydraulic oil flows in the oil passing gap 15 and pushes the valve core 20 to compress the elastic assembly 30. Therefore, according to the actual needs, the structure of opening the oil passing groove only in the valve seat 10, or the structure of opening the oil passing groove only in the second valve core segment 23, or the structure of opening the oil passing groove in the valve seat 10 and the valve core 20 at the same time can be selected, and the present embodiment is not limited.

[0046] In addition, as shown in Figure 1 and Figure 3As shown, the valve core 20 further comprises a third valve core section 24, which is arranged at one end of the second valve core section 23 away from the first valve core section 22 and is in sliding guide cooperation with the inner wall of the oil passage 13. Such a structure can ensure the stability of the valve core 20 when sliding in the axial direction, effectively avoid the shaking of the valve core 20, and thus produce a good hydraulic effect and improve the use experience.

[0047] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not a limitation on the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A relief valve, characterized in that: include: A valve seat (10) includes an oil inlet hole (11) and an oil return hole (12), wherein the oil inlet hole (11) and the oil return hole (12) are connected via an oil passage (13); an abutment portion (14) is provided on an inner wall of the valve seat (10), and the abutment portion (14) is provided between the oil inlet hole (11) and the oil return hole (12); A valve core (20) is movably arranged in the valve seat (10) along the axial direction of the valve seat (10), and an arc-shaped protrusion (21) is circumferentially provided on the valve core (20). The diameter of the arc-shaped protrusion (21) gradually decreases in a direction approaching the oil inlet hole (11). The arc-shaped protrusion (21) can abut or move away from the abutting portion (14) to close or open the oil passage (13).

2. The relief valve according to claim 1, characterized in that The cross section of the arc-shaped protrusion (21) along the axial direction of the valve seat (10) is wing-shaped.

3. The relief valve according to claim 2, characterized in that: The abutting portion (14) has an inclined surface for abutting and sealing with the arc-shaped protrusion (21); the arc-shaped protrusion (21) can abut and seal with the inclined surface to close and seal the oil passage (13).

4. The relief valve according to claim 1, characterized in that The valve core (20) comprises a first valve core section (22) and a second valve core section (23) connected in sequence, the arc-shaped protrusion (21) being arranged on the outer periphery of the first valve core section (22), and when the arc-shaped protrusion (21) abuts against the abutting portion (14), the second valve core section (23) can extend into the oil passage (13) and form an oil passage gap (15) between the second valve core section (23) and the oil passage (13), and the oil passage gap (15) is communicated with the oil inlet hole (11).

5. The relief valve according to claim 4, characterized in that: Along the axial direction of the second valve core section (23), the oil passage gap (15) is arranged in the form of an annular cavity between the second valve core section (23) and the inner wall of the oil passage (13).

6. The relief valve according to claim 4, characterized in that The overflow valve includes an oil passage groove, which is located on the valve seat (10) and / or the second valve core section (23). When the oil passage groove is located on the valve seat (10), the groove wall of the oil passage groove is recessed relative to the inner wall of the valve seat (10) toward a side away from the second valve core section (23) to form the oil passage gap (15); when the oil passage groove is located on the second valve core section (23), the groove wall of the oil passage groove is recessed relative to the surface of the second valve core section (23) toward a side away from the valve seat (10) to form the oil passage gap (15).

7. The relief valve according to claim 4, characterized in that The valve core (20) further comprises a third valve core section (24), the third valve core section (24) being arranged at an end of the second valve core section (23) away from the first valve core section (22), and the third valve core section (24) being in sliding and guiding cooperation with the inner wall of the oil passage (13).

8. The relief valve according to any one of claims 1 to 6, characterized in that: The overflow valve further comprises an elastic component (30) and an adjusting component (40), wherein the adjusting component (40) is arranged at one end of the valve seat (10) away from the oil inlet hole (11), the adjusting component (40) is threadedly engaged with the valve seat (10), one end of the elastic component (30) abuts against the adjusting component (40), and the other end abuts against the valve core (20).

9. The relief valve according to claim 8, characterized in that The elastic component (30) comprises an elastic member (31) and a spring seat (32), one end of the elastic member (31) is connected to or abuts against the spring seat (32), and the other end abuts against the regulating component (40), and the side of the spring seat (32) facing away from the elastic member (31) abuts against the valve core (20).

10. The relief valve according to claim 9, characterized in that The adjustment assembly (40) is provided with a limiting cavity (411) along the axial direction, and one end of the elastic member (31) away from the spring seat (32) can extend into the limiting cavity (411) and abut against the bottom of the limiting cavity (411).

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