A one-way valve for a hydraulic cylinder

Abstract

The application discloses a one-way valve for an oil cylinder, which comprises a flow guide block, a flow channel is arranged in the side wall of the flow guide block, an inflow port is arranged on the side wall of the flow guide block, overflow ports are arranged at one end of the flow guide block, the overflow ports are communicated with the inflow port through the flow channel, a flow blocking piece is arranged on the overflow ports, and a supporting assembly is arranged on the flow guide block, wherein the supporting assembly comprises an elastic piece, the elastic piece is used for driving the flow blocking piece to cover the overflow ports, the flow blocking piece can move away from the overflow ports and drive the elastic piece to deform, and multiple overflow ports are arranged on the flow guide block and communicated with the flow channel, the outflow area is increased, the flow blocking piece can realize a large radial overflow area by being lifted by a small distance, the flow resistance of the positive outflow is greatly reduced, and a small opening pressure can be realized.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic equipment, and specifically relates to a one-way valve for hydraulic cylinders. Background Technology

[0002] Check valves, also known as one-way valves, are widely used in hydraulics, primarily serving to prevent backflow of hydraulic fluid. The need to integrate check valves within hydraulic cylinders is often seen in closed-loop damping cylinders where miniaturization and weight reduction are critical, such as hydraulic pneumatic springs, hydraulic knee prostheses, and reciprocating piston pumps. Existing check valves are mainly classified into spring-loaded and springless types.

[0003] Springless check valves mainly include lift and swing check valves. The reverse flow of fluid relies on the gravity of the ball or valve disc inside the valve body to close the flow port. The installation angle is also subject to strict requirements, making them prone to water hammer and component damage. Because the valve core is driven solely by gravity, any failure to close the flow port in time can lead to backflow of some oil, making them unsuitable for applications with high frequency response and stringent flow requirements.

[0004] Among them, spring-loaded check valves use the preload force of a spring to provide the positive opening pressure of the valve disc. In the prior art, the flow area of ​​the internal flow port of existing direct-acting check valves is relatively small, resulting in a small opening degree when the pressure difference is small, and a large flow resistance in the positive direction. The above problems are technical issues that urgently need to be solved in this field. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems, the present invention provides a one-way valve for hydraulic cylinders, which can effectively reduce the flow resistance of the forward outflow and achieve a smaller opening pressure.

[0006] The technical solution of this invention to solve the above-mentioned technical problems is as follows: A one-way valve for a hydraulic cylinder includes a guide block, a flow channel is provided in the side wall of the guide block, an inlet is provided on the side wall of the guide block, and an overflow port is opened at one end of the guide block. The overflow port includes multiple overflow ports, and the inlet and the overflow port are connected through the flow channel; and

[0007] A flow-blocking element, its sealing cover being fitted onto the overflow port, the flow-blocking element being movable away from the overflow port; and

[0008] A support assembly, the support assembly including an elastic element for driving the flow-blocking element to reset to cover the overflow port.

[0009] The beneficial effects of the one-way valve for hydraulic cylinders disclosed in this application are: by setting multiple overflow ports connected to the flow channel, the outflow area is increased, and the flow obstruction element can achieve a large radial overflow area by lifting only a small distance, which greatly reduces the flow resistance of the positive outflow and achieves a smaller opening pressure.

[0010] In one optional embodiment, the guide block is an annular structure, and the guide block is provided with a first through hole axially penetrating the guide block. The support component further includes a limiting block, which is disposed on the guide block and has a second through hole coaxial with the first through hole. The elastic element is a wave spring, which is sleeved on the limiting block.

[0011] In terms of reverse flow control, this application utilizes the large stiffness of the wave spring and the flow-blocking component to simultaneously cover multiple overflow ports. The flow-blocking component has a large force-bearing area and a light weight, making it more sensitive to pressure changes and achieving a faster flow control speed. It can adapt to relatively rapid alternating pressure.

[0012] In one optional embodiment, the end of the limiting block near the overflow port extends out of the guide block and is provided with a flange, the wave spring is located between the flange and the guide block, and the two ends of the wave spring are respectively connected to the flange and the flow blocking element.

[0013] In one optional embodiment, a plurality of overflow ports are arranged around the first through hole, and the flow obstruction element is an annular structure and is sleeved on the limiting block.

[0014] This application sets the guide block and limiting block into a ring structure, and combines them with a wave spring and a ring-shaped flow-blocking spring to fit the geometric characteristics of the hydraulic cylinder, which can effectively reduce the size of this application. When this application is used with the hydraulic cylinder, it can be installed on either the rod-side or the rodless side of the hydraulic cylinder.

[0015] In one optional embodiment, the limiting block is sleeved inside the first through hole, and the limiting block is provided with an axial positioning structure for axial positioning of the limiting block.

[0016] In one alternative embodiment, the outer side of the limiting block is threadedly connected to the inner side of the first through hole.

[0017] In one optional embodiment, the axial positioning structure includes a positioning shoulder disposed on the limiting block, the positioning shoulder abutting against the end face of the guide block where the overflow port is disposed.

[0018] In one optional embodiment, an annular groove is provided on the outer side of the flow guide block, and the flow inlet is disposed within the annular groove.

[0019] In one alternative embodiment, at least two seals are arranged around the outside of the flow guide block, and the inlet is located between the two seals.

[0020] This application also provides a hydraulic cylinder, which includes the aforementioned one-way valve and cylinder body, wherein the one-way valve is integrally sleeved within the cylinder body, and the inlet is connected to the liquid inlet on the cylinder body. Attached Figure Description

[0021] Figure 1 This is an assembly cross-sectional view of an embodiment of this application in the reverse flow interception state;

[0022] Figure 2 This is an assembly cross-sectional view of an embodiment of this application in the forward flow state;

[0023] Figure 3 This is an exploded assembly view A of an embodiment of this application;

[0024] Figure 4 This is an exploded assembly view B of an embodiment of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Flow obstruction component; 2. Wave spring; 3. Flow guide block; 4. Limiting block; 5. Sealing ring; 6. Cylinder body; 7. Overflow port; 8. Flow channel; 9. First through hole; 10. Second through hole; 11. Flange; 12. Positioning shoulder; 13. Annular groove; 14. Inlet. Detailed Implementation

[0026] The principles and features of this application are described below with reference to the accompanying drawings and embodiments. The examples given are only for explaining this application and are not intended to limit the scope of this application.

[0027] The following discloses various implementation methods or embodiments of the described subject matter technical solutions. To simplify the disclosure, specific embodiments of one or more arrangements of the features are described below, but the embodiments are not intended to limit this specification. The connection between the first feature and the second feature described later in the specification can include implementations with direct connection, implementations that form additional features, and further, implementations that use one or more other intervening features to indirectly connect or combine the first feature and the second feature with each other, so that the first feature and the second feature are not directly connected.

[0028] like Figures 1 to 4 As shown, this application discloses an embodiment of a one-way valve for a hydraulic cylinder, including a flow guide block 3, a flow obstruction element 1, a support assembly, and a limiting block 4.

[0029] The aforementioned guide block 3 is an overall annular sleeve structure. The guide block 3 has a first through hole 9 that axially penetrates the guide block 3, and the first through hole 9 allows the piston rod in the oil cylinder to pass through.

[0030] The aforementioned guide block 3 has a flow channel 8 formed in its side wall, for example, Figure 1 and Figure 2 A cross-sectional view of the flow channel 8 is shown. The flow channel 8 can be composed of two sections, including a vertical channel and a horizontal channel, which are connected to each other to form the flow channel 8 as a whole. In addition, in some other examples, the flow channel 8 can be composed of only one section, which can be a straight flow channel 8 or a flow channel 8 with a certain degree of curvature. This application does not make any specific limitations.

[0031] In this application, the two ends of the flow channel 8 are defined as the overflow port 7 and the inlet port 14, respectively. In the embodiments disclosed in this application, such as Figures 1 to 4 As shown, the inlet 14 is opened on the outer side of the side wall of the guide block 3, and the overflow port 7 is opened on the end face of the guide block 3. The overflow port 7 can include multiple ports. For example, Figure 3 shows a case with twelve overflow ports 7. Multiple overflow ports 7 are arranged around the first through hole 9.

[0032] In the embodiments disclosed in this application, the flow-blocking element 1 is integrally sealed and covered onto the overflow port 7, such as... Figure 3 As shown, in some examples, the flow-blocking element 1 is an annular flow-blocking spring. In this example, all overflow ports 7 can be covered by only one flow-blocking element 1.

[0033] like Figure 3 As shown, the support assembly is used to support the flow obstruction member 1. The support assembly consists of an elastic member and a limiting block 4. The limiting block 4 is used to fix the elastic member. The elastic member is used to drive the flow obstruction member 1 to cover the overflow port 7. The flow obstruction member 1 can move away from the overflow port 7 and drive the elastic member to deform. In order to reset, the elastic member will drive the flow obstruction member 1 to reset.

[0034] For example, in some examples, such as Figure 3 As shown, the limiting block 4 and the guide block 3 are coaxially arranged. The limiting block 4 has a second through hole 10 coaxial with the first through hole 9. The second through hole 10 can also allow the piston rod of the oil cylinder to pass through. The end of the limiting block 4 near the overflow port 7 extends out of the guide block 3 and is provided with a flange 11. In this example, the elastic element is a wave spring 2. The wave spring 2 is sleeved on the limiting block 4 and located between the flange 11 and the end face of the guide block 3 where the overflow port 7 is provided. The top end of the wave spring 2 is fixedly connected to the lower surface of the flange 11, and its bottom end is fixedly connected to the flow blocking element 1. The maximum height from the lower surface of the flange 11 to the upper surface of the flow blocking element 1 is less than the free height of the wave spring 2. Therefore, under the elastic force of the wave spring 2, the flow blocking element 1 can be squeezed, thereby covering the overflow port 7 and achieving a seal. In some examples, such as Figure 3As shown, the flange 11 can be arranged circumferentially around the limiting block 4. It can be an integral ring structure or a combination of several protrusions protruding from the side of the limiting block 4.

[0035] In addition, in some examples, such as Figure 1 and Figure 2 As shown, the end of the limiting block 4 away from the flange 11 can be sleeved with the inner side of the first through hole 9. For example, the outer side of the limiting block 4 is provided with an external thread, and the inner side of the first through hole 9 is provided with an internal thread. The limiting block 4 is then threadedly connected to the inner side of the guide block 3.

[0036] Based on the limiting block 4 being sleeved inside the guide block 3, and since the wave spring 2 is connected to the limiting block 4, in order to ensure that the limiting block 4 is in a suitable position in the axial direction, that is, to satisfy the condition that the distance between the flange 11 and the overflow port 7 must be less than the free height of the wave spring 2, an axial positioning structure is also fixed on the limiting block 4. The axial positioning structure is used to axially position the limiting block 4.

[0037] For example, such as Figures 1 to 4 As shown, the above-mentioned axial positioning structure can be a positioning shoulder 12 fixed on the limiting block 4 near one end of the flange 11. The diameter of the positioning shoulder 12 is between the diameter of the first through hole 9 and the diameter of the flange 11. When the limiting block 4 moves axially, the upper end face of the guide block 3 can block the axial movement of the positioning shoulder 12, thereby achieving axial positioning.

[0038] Taking the threaded connection between the limiting block 4 and the guide block 3 as an example, when the limiting block 4 and the guide block 3 are coaxial, the limiting block 4 is rotated to move axially. When the limiting block 4 moves to a suitable height, the positioning shoulder 12 of the limiting block 4 is in contact with the upper end face of the guide block 3. The guide block 3 axially positions the limiting block 4 as a whole by blocking the movement of the positioning shoulder 12.

[0039] In addition, in some examples, such as Figure 3 As shown, an annular groove 13 is provided on the outer side of the flow guide block 3, and the inlet 14 is provided in the annular groove 13.

[0040] like Figure 1 and Figure 2 As shown, in an embodiment where this application is used in a hydraulic cylinder, the entire application is fitted into the cylinder body 6 of the hydraulic cylinder, and the aforementioned annular groove 13 is aligned with the hydraulic cylinder's inlet. In a specific application example, two seals are provided on the upper and lower sides of the annular groove 13 to seal the space between the cylinder body 6 and the guide block 3, preventing hydraulic oil from entering the cylinder body 6 through the space between the guide block 3 and the cylinder body 6. For example... Figure 3 and Figure 4As shown, the above-mentioned guide block 3 has annular slots on the upper and lower sides of the annular groove 13, and a sealing ring 5 is engaged in the annular slot as a sealing element.

[0041] The overall working principle of this application is as follows:

[0042] like Figure 1 As shown, when the pressure in the flow channel 8 is lower than the pressure in the cylinder, and the pressure difference between the upper and lower surfaces of the flow obstruction 1 is lower than the elastic force of the wave spring 2, the wave spring 2 supports the flow obstruction 1. Under the action of the wave spring 2, the flow obstruction 1 blocks the overflow port 7 on the upper surface of the guide block 3. At this time, the liquid cannot enter the flow channel 8 through the overflow port 7.

[0043] like Figure 2 As shown, when liquid is injected into the flow channel 8, the pressure inside the flow channel 8 is higher than the pressure inside the cylinder 6. When the pressure difference between the upper and lower surfaces of the flow obstruction 1 is higher than the elastic force of the wave spring 2, the flow obstruction 1 is lifted by the high-pressure oil in the flow channel 8, and the wave spring 2 is compressed. At this time, the oil can flow into the cylinder 6 through the overflow port 7.

[0044] The present application has an overall ring structure, which can fit the geometric features of the hydraulic cylinder and make the present application have a small volume. It can be installed on the rod side or the rodless side of the hydraulic cylinder.

[0045] Meanwhile, by setting multiple annular overflow ports 7, the area for fluid to enter the cylinder 6 is increased, and the flow obstruction component 1 can achieve a large radial overflow area by lifting only a small distance, which greatly reduces the flow resistance of the forward outflow and can greatly reduce the opening pressure.

[0046] In addition, the wave spring 2 is used as the element to maintain the positive opening pressure of the present application, which can save space in the cylinder. In terms of reverse flow blocking, since the wave spring 2 has a large stiffness, and in combination with the annular flow blocking spring, the flow blocking spring has a large force-bearing area and a light weight, so it is more sensitive to pressure changes, the flow blocking speed is faster, and it can adapt to relatively rapid alternating pressure.

[0047] In the description of this specification, it should be understood that the terms "center," "length," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "inner," "outer," "circumferential," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this specification.

[0048] In the description of this specification, "multiple" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] The terminology used in this specification is that which is currently widely used in the art in consideration of the functionality of this disclosure; however, these terms may vary depending on the intent, precedent, or new technology of those skilled in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of this disclosure. Therefore, the terminology used in this specification should not be construed as simple names, but rather based on the meaning of the terms and the overall description of this disclosure.

[0051] This specification uses flowcharts or text to illustrate the operational steps performed according to the embodiments of this application. It should be understood that the operational steps in the embodiments of this application are not necessarily performed precisely in the order described. Instead, as needed, various steps can be processed in reverse order or simultaneously. Furthermore, other operations can be added to these processes, or one or more operations can be removed from these processes.

[0052] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A one-way valve for a hydraulic cylinder, characterized in that, Includes a flow guide block (3), a flow channel (8) is provided in the side wall of the flow guide block (3), an inlet (14) is provided on the side wall of the flow guide block (3), and an overflow port (7) is provided at one end of the flow guide block (3). The overflow port (7) includes multiple overflow ports, and the inlet (14) and the overflow port (7) are connected through the flow channel (8); and A flow-blocking element (1) is sealed to the overflow port (7), and the flow-blocking element (1) can move away from the overflow port (7); as well as The support assembly includes an elastic element for driving the flow-blocking element (1) to reset and cover the overflow port (7). The flow guide block (3) is an annular structure with a first through hole (9) axially penetrating the flow guide block (3). The support assembly also includes a limiting block (4) disposed on the flow guide block (3) and a second through hole (10) coaxial with the first through hole (9). The elastic element is a wave spring (2) sleeved on the limiting block (4). Multiple overflow ports (7) surround the first through hole (7). A through hole (9) is provided. The flow obstruction element (1) is an annular structure and is sleeved on the limiting block (4). The limiting block (4) is sleeved inside the first through hole (9). An axial positioning structure is provided on the limiting block (4). The axial positioning structure is used to axially position the limiting block (4). The axial positioning structure includes a positioning shoulder (12) provided on the limiting block (4). The positioning shoulder (12) abuts against the end face of the guide block (3) where the overflow port (7) is provided. An annular groove (13) is provided on the outer circumferential surface of the guide block (3). The inlet (14) is provided in the annular groove (13).

2. The one-way valve for a hydraulic cylinder as described in claim 1, characterized in that, The limiting block (4) extends from the guide block (3) near the overflow port (7) and is provided with a flange (11). The wave spring (2) is located between the flange (11) and the guide block (3). The two ends of the wave spring (2) abut against the flange (11) and the flow blocking member (1) respectively.

3. The one-way valve for a hydraulic cylinder as described in claim 1, characterized in that, The outer side of the limiting block (4) is threadedly connected to the inner side of the first through hole (9).

4. The one-way valve for a hydraulic cylinder as described in claim 1, characterized in that, At least two seals are arranged around the outside of the flow guide block (3), and the inlet (14) is located between the two seals.

5. A hydraulic cylinder, characterized in that, The device includes a one-way valve and a cylinder (6) as described in any one of claims 1 to 4, wherein the one-way valve is integrally fitted inside the cylinder (6), and the inlet (14) is connected to the liquid inlet on the cylinder (6).

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