Valve element reversing structure

Abstract

The utility model relates to the technical field of hydraulic systems, in particular to a valve element reversing structure. A valve element reversing structure comprises a positioning rod, a valve element, a valve element, a valve element, a valve element, a valve element, a valve element, a valve element and a valve element, and the positioning rod is in follow-up fit with the valve element; and the positioning ball is arranged on the periphery of the positioning rod, the positioning ball moves in the radial direction under the action of an elastic piece so as to keep making contact with the outer surface of the positioning rod, and the positioning ball is matched with the positioning structure so as to position the valve element. According to one embodiment of the utility model, the positioning structure comprises a positioning inclined surface, and the positioning inclined surface can block the positioning ball to realize limiting. According to one embodiment of the utility model, the positioning structure comprises a positioning groove, and the positioning ball can be embedded into the positioning groove. The technical problem that in the prior art, in order to achieve limiting of different strokes, a reversing valve is limited in the mode that a screw strikes an end cover, and the structure is prone to being damaged is solved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system technology, and in particular to a valve core reversing structure. Background Technology

[0002] A directional control valve is a widely used hydraulic component in hydraulic systems, primarily used for switching the direction of media flow. During sliding reversal, the valve spool of a directional control valve needs to be in different positions to maintain oil circuit connectivity. Therefore, a limit structure is often required to limit the different strokes of the valve spool when it is pushed or pulled to different operating positions.

[0003] like Figure 1 The prior art valve core reversing structure shown has a screw 2' connected to one end of the valve core 1'. A first spring seat 4' and a second spring seat 5' are slidably mounted on the screw 2'. A spring 3' is disposed between the first spring seat 4' and the second spring seat 5'. The distance D1' between the first spring seat 4' and the second spring seat 5' is the mechanical limit for the valve core displacement. The mechanical limit for the push-pull stroke is the same, which cannot achieve mechanical limit for different strokes of the valve core 1' in different operating positions. If different strokes of mechanical limit are required, the distance D2' between the bottom end face of the screw 2' and the inner bottom surface of the end cover can be set to be less than the distance D1'. The screw 2' can then strike the inner bottom surface of the end cover to limit the stroke, thus achieving different strokes of mechanical limit for different operating positions. However, there are structural strength problems due to the small effective area, and this structure cannot determine whether the valve core stops at the required position. In other words, the above structure can limit the valve core, but it is difficult to limit different strokes, and the method of limiting by the screw striking the end cover is prone to structural damage. Utility Model Content

[0004] To address the technical problem that existing directional control valves, which use screws to impact the end cap for limiting different strokes, are prone to structural damage, this invention provides a valve core reversing structure that solves the aforementioned technical problem.

[0005] To solve the above-mentioned technical problems, this utility model provides a valve core reversing structure, including:

[0006] A positioning rod, which is in responsive engagement with the valve core, and a positioning structure is formed on the outer circumferential surface of the positioning rod;

[0007] A positioning ball is arranged on the outer periphery of the positioning rod. Under the action of an elastic element, the positioning ball moves radially to maintain contact with the outer surface of the positioning rod. The positioning ball cooperates with the positioning structure to achieve the positioning of the valve core.

[0008] According to one embodiment of the present invention, the positioning structure includes a positioning inclined surface, which can block the positioning ball to achieve a limiting position.

[0009] According to one embodiment of the present invention, the positioning structure includes a positioning groove, and the positioning ball can be embedded in the positioning groove.

[0010] According to one embodiment of the present invention, the positioning ball is assembled on the ball seat, the slide is slidably sleeved on the ball seat, and presses the positioning ball under the action of the elastic element, and the contact surface between the slide and the positioning ball is a conical surface.

[0011] According to one embodiment of the present invention, the ball seat is assembled inside the end cap, and the ball seat and the end cap are connected by a snap-fit ​​connection.

[0012] According to one embodiment of the present invention, the outer periphery of the ball seat extends with a circumferential outer edge, the circumferential outer edge is snapped into connection with the end cap, and the circumferential outer edge limits the slide seat.

[0013] According to one embodiment of the present invention, a spring is provided at the connection between the positioning rod and the valve core, and a first spring seat and a second spring seat are respectively provided at both ends of the spring. The first spring seat and the second spring seat are slidably assembled on the positioning rod, and the outer ends of the first spring seat and the second spring seat are respectively limited.

[0014] According to one embodiment of the present invention, the end face of the valve core near the positioning rod can limit the inner end of the first spring seat, and the positioning rod has a first limiting surface that can limit the inner end of the second spring seat.

[0015] According to one embodiment of the present invention, a second limiting surface is also formed on the positioning rod, the second limiting surface being located between the valve core end face and the first limiting surface.

[0016] According to one embodiment of the present invention, when the valve core drives the positioning rod to move in a first direction, the second limiting surface can abut against the first spring seat to limit the position of the valve core; when the valve core drives the positioning rod to move in a second direction, the positioning ball and the positioning structure cooperate to limit the position of the valve core.

[0017] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0018] This utility model's valve core reversing structure utilizes a positioning structure on a positioning rod. A positioning ball, capable of only radial movement, is positioned on the outer periphery of the positioning rod. Under the action of an elastic element, the positioning ball remains in contact with the outer surface of the positioning rod. When the valve core reverses direction, it drives the positioning rod. The positioning structure on the positioning rod, in conjunction with the positioning ball, limits the position of the valve core, ensuring the accuracy of the valve core's reversing position. By employing this positioning ball and positioning structure limiting method, the position of the positioning structure can be set as needed to achieve different stroke limits, while also avoiding impact to the end cover and effectively protecting the structure from damage.

[0019] The valve core reversing structure of this utility model includes a positioning structure comprising a positioning inclined surface. When the valve core reverses, the positioning inclined surface blocks the positioning ball, and the resistance of the positioning inclined surface against the positioning ball indicates that the valve core has reached the correct position. The positioning structure also includes a positioning groove, allowing the positioning ball to enter and thus positioning the valve core and maintaining it in a specific working state. The positioning structure can be configured to include a positioning groove and / or a positioning inclined surface as needed, enabling positioning and limiting functions, controlling the valve core's stroke, and preventing the positioning rod from impacting the end cover and damaging the structure.

[0020] In this utility model's valve core reversing structure, a positioning ball is mounted on a ball seat, and a slide block is slidably fitted onto the ball seat. Under the action of an elastic element, the conical surface of the inner surface of the slide block can maintain contact with the positioning ball. The elastic element acts axially on the slide block, generating a radially inward pushing force on the positioning ball, keeping the positioning ball in contact with the outer surface of the positioning rod. When the positioning ball is pushed outward by the positioning rod, the slide block can also overcome the force of the elastic element and move axially, leaving clearance for the positioning ball.

[0021] The valve core reversing structure of this utility model has a ball seat and an end cover that are snapped together, which facilitates the installation between the ball seat and the end cover. The axial outer edge of the ball seat can be connected to the end cover on the one hand, and can also limit the movement of the slide on the other hand. The positioning ball is set outside the positioning rod through the ball seat. Only the positioning bevel and / or positioning groove need to be machined on the positioning rod, which reduces the machining difficulty. Moreover, the force exerted by the positioning ball on the positioning rod is small and will not affect the movement of the valve core.

[0022] The valve core reversing structure of this utility model has a spring at the connection between the positioning rod and the valve core, and a spring seat is provided. The positioning rod has a limiting surface, and the valve core end face can also cooperate with the limiting spring seat, so that the maximum stroke of the valve core movement can be limited. It can also limit the position of the valve core when the valve core moves in the first direction; when the valve core moves in the second direction, it is limited by the positioning ball and the positioning structure. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a valve core reversing structure in the prior art.

[0024] Figure 2This is a schematic diagram of the valve core reversing structure of this utility model;

[0025] Figure 3 This is a schematic diagram of the positioning rod.

[0026] Figure 4 A schematic diagram showing the structure in which the ball seat and slide are installed inside the end cover;

[0027] Figure 5 This is a diagram showing the state where the valve core is limited when it moves to the left position.

[0028] Figure 6 This is a diagram showing the state of the valve core when it is limited to the rightmost position.

[0029] Figure 7 This is a diagram showing the valve core in its current position when it has moved to the second position from the right.

[0030] In the diagram: 1-Positioning rod; 11-Positioning structure; 111-Positioning inclined surface; 112-Positioning groove; 12-First limiting surface; 13-Second limiting surface; 14-Third limiting surface; 2-Positioning ball; 3-Elastic element; 4-Ball seat; 41-Circumferential outer edge; 411-Groove; 5-Slide seat; 51-Conical surface; 6-End cap; 7-Spring; 81-First spring seat; 82-Second spring seat; 10-Valve core; 20-Valve body; 1'-Valve core; 2'-Screw; 3'-Spring; 4'-First spring seat; 5'-Second spring seat. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0032] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0034] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0035] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0036] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0037] like Figure 2 As shown, this embodiment proposes a valve core reversing structure, including a positioning rod 1 and a positioning ball 2. The positioning rod 1 is dynamically engaged with the valve core 10. The positioning ball 2 is arranged on the outer periphery of the positioning rod 1 and is kept in contact with the outer surface of the positioning rod 1 under the action of the elastic element 3. A positioning structure 11 is formed on the outer peripheral surface of the positioning rod 1. The positioning ball 2 only moves radially. When the valve core 10 drives the positioning rod 1 to move to the position where the positioning structure 11 corresponds to the position of the positioning ball 2, the positioning ball 2 and the positioning structure 11 can cooperate to limit the position of the valve core 10.

[0038] The valve core 10 is slidably assembled inside the valve body 20. One end of the valve core 10 is connected to a positioning rod 1. The positioning rod 1 moves with the valve core 10. The end cap 6 is fixed on the valve body 20 and covers the positioning rod 1 to form a sealed space.

[0039] like Figure 3 As shown, the positioning rod 1 is rod-shaped, and one end of the positioning rod 1 is connected to the valve core 10; the outer surface of the positioning rod 1 has a positioning structure 11, which cooperates with the positioning ball 2.

[0040] As a preferred embodiment, the end of the positioning rod 1 that connects to the valve core 10 is threaded, and the valve core 10 and the positioning rod 1 are threadedly connected. Specifically, the end of the valve core 10 may have a threaded hole, and the outer surface of the positioning rod 1 may have an external thread. The positioning rod 1 extends into the threaded hole of the valve core 10 and is threadedly connected to the valve core 10. The positioning rod 1 and the valve core 10 are coaxially connected.

[0041] As a preferred technical solution in this embodiment, the positioning structure 11 includes a positioning ramp 111, which can block the positioning ball 2 and provide resistance to the positioning ball 2, so that the displacement can be sensed during operation. The positioning ramp 111 provides resistance to the positioning ball 2 and also facilitates the positioning ball 2 to pass through the positioning ramp 111.

[0042] As a preferred embodiment, the positioning structure 11 includes a positioning groove 112, which is a semi-circular groove. The positioning ball 2 can be embedded in the positioning groove 112 to achieve a positioning function. In this way, the valve core 10 can be held in the corresponding position without the need for continuous external force. The positioning structure 11 may include a positioning inclined surface 111 and / or a positioning groove 112 to facilitate cooperation with the positioning ball 2 and to limit different strokes. In this embodiment, the positioning structure 11 includes both a positioning inclined surface 111 and a positioning groove 112, which are arranged adjacent to each other. The positioning inclined surface 111 can be used to limit the valve core 10 to the right position when it moves to the right, and the positioning groove 112 can be used to position the valve core 10 to the right position when it continues to move to the right.

[0043] As a preferred embodiment, a limiting surface is also provided on the outer surface of the positioning rod 1. A first limiting surface 12, a second limiting surface 13, and a third limiting surface 14 are formed on the outer surface of the positioning rod 1. The third limiting surface 14 abuts against the end face of the valve core 10, limiting the assembly position of the positioning rod 1 and the valve core 10. The second limiting surface 13 is located between the first limiting surface 12 and the third limiting surface 14. A spring 7 and a spring seat are provided on the outside of the positioning rod 1. The end face of the valve core 10 and the third limiting surface 14 can drive the spring seat to slide and compress the spring 7. The second limiting surface 13 can abut against the spring seat to limit the valve core 10 to the left position when it moves to the left. Preferably, the first limiting surface 12, the second limiting surface 13, and the third limiting surface 14 can all be stepped surfaces. The outer diameter of the first limiting surface 12 can be equal to the inner diameter of the second limiting surface 13; the outer diameter of the second limiting surface 13 can be equal to the inner diameter of the third limiting surface 14.

[0044] Spring 7 is sleeved on the end of positioning rod 1 that is connected to valve core 10. Spring seats are provided at both ends of spring 7, namely first spring seat 81 and second spring seat 82. The inner ends of first spring seat 81 and second spring seat 82 slide along positioning rod 1, and the outer ends of first spring seat 81 and second spring seat 82 can be limited to the maximum range of motion by a fixing structure.

[0045] Specifically, in the initial state, the inner end of the first spring seat 81 is in contact with the end face of the valve core 10, the outer end of the first spring seat 81 is limited by the outer surface of the valve body 20 or a stop piece mounted on the outer surface of the valve body 20, the outer end of the second spring seat 82 is limited by the internal fixed mounting structure of the end cover 6, and the inner end of the second spring seat 82 is in contact with the first limiting surface 12. When the valve core 10 drives the positioning rod 1 to move to the left, the second limiting surface 13 can abut against the inner end of the first spring seat 81 to limit the leftward travel.

[0046] The positioning ball 2 is mounted on the ball seat 4, which is spaced around the outer periphery of the positioning rod 1. The ball seat 4 has radially extending mounting holes, and the positioning ball 2 is located inside the mounting holes. The ball seat 4 is slidably fitted with a slide block 5. Under the action of the elastic element 3, the inner surface of the slide block 5 presses against the positioning ball 2, so that the positioning ball 2 is in contact with the outer surface of the positioning rod 1.

[0047] As a preferred technical solution in this embodiment, the inner surface of the slide block 5 includes a tapered surface 51, which contacts the positioning ball 2; the elastic element 3 acts axially on the slide block 5, and the elastic element 3 provides the slide block 5 with an axial force toward the ball seat 4. Due to the action of the tapered surface 51, the force exerted by the slide block 5 on the positioning ball 2 has a radially inward component, which can make the positioning ball 2 elastically pressed against the outer surface of the positioning rod 1.

[0048] As a preferred technical solution in this embodiment, multiple positioning balls 2 can be set and evenly distributed circumferentially on the ball seat 4. In this embodiment, three positioning balls 2 are set.

[0049] As a preferred embodiment, the ball seat 4 is assembled inside the end cover 6. To facilitate assembly with the end cover 6, the outer surface of the ball seat 4 extends with a circumferential outer edge 41, and a groove 411 is formed on the circumferential outer edge 41 to facilitate a snap-fit ​​connection with the end cover 6. Simultaneously, the slide 5 can abut against the circumferential outer edge 41 to limit its movement. Preferably, the groove 411 is an arc-shaped groove.

[0050] As a preferred technical solution in this embodiment, the radial inner end of the mounting hole of the ball seat 4 is punched using a stamping process to prevent the positioning ball 2 from coming out inward.

[0051] End cap 6 is fixed to valve body 20. End cap 6 covers positioning rod 1, positioning ball 2, elastic element 3, ball seat 4, slide 5, spring 7, and spring seat. End cap 6 can be made of materials such as zinc alloy and is crimped. Figure 4 As shown, the end cap 6 fills the groove 411 of the ball seat 4, so that the end cap 6, ball seat 4, elastic element 3 and slide 5 can become an integral part, which is then fixed to the valve body 20 by fasteners.

[0052] Based on the above structure, the valve core reversing structure of this embodiment operates as follows:

[0053] Taking a four-position valve core as an example, valve core 10 is divided into left position, middle position, right first position, and right second position in sequence. From an operational perspective, the valve core displacements of the left position and right first position are the same, while the displacement of the right second position is greater than that of the right first position. The valve core displacements of the left position and right first position can be set to the same stroke or different strokes as needed.

[0054] like Figure 5 As shown, when the valve core 10 moves to the left, when the second limiting surface 13 contacts the inner end of the first spring seat 81, it reaches the mechanical limit of the left position, and the valve core cannot continue to move to the left. The displacement distance of the valve core is the distance from the inner end of the first spring seat 81 to the second limiting surface 13.

[0055] like Figure 6 As shown, when the valve core 10 moves to the right, the second limiting surface 13 does not play a limiting role. When the positioning ball 2 reaches the right position, the positioning ball 2 reaches the bottom of the positioning slope 111. It requires a greater operating force to make the positioning ball 2 climb up the positioning slope 111. The positioning slope 111 provides resistance to the movement of the positioning ball 2. There will be a clear sense during manual operation, which can realize precise control of the valve core to the target operating position.

[0056] like Figure 7As shown, the valve core 10 continues to move to the right, and the inner ends of the first spring seat 81 and the second spring seat 82 come into contact, reaching the right second mechanical limit. At this time, the valve core 10 can no longer move to the right. The valve core 10 is located at the distance between the inner ends of the first spring seat 81 and the second spring seat 82. When the reversing operation force is removed, the positioning ball 2 is positioned in the positioning groove 112 under the action of the elastic element 3. The valve core 10 will not automatically return to the middle position due to the reset force of the spring 6 when there is no operation force, thus realizing the positioning function of the valve core 10 in the target operation position.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A valve core reversing structure, characterized in that, include: Positioning rod (1), which is in responsive cooperation with valve core (10), and a positioning structure (11) is formed on the outer circumferential surface of the positioning rod (1). Positioning ball (2) is arranged on the outer periphery of the positioning rod (1). Under the action of the elastic element (3), the positioning ball (2) moves radially to maintain contact with the outer surface of the positioning rod (1). The positioning ball (2) cooperates with the positioning structure (11) to realize the positioning of the valve core (10).

2. The valve core reversing structure according to claim 1, characterized in that, The positioning structure (11) includes a positioning ramp (111), which can block the positioning ball (2) to achieve a limit.

3. A valve core reversing structure according to any one of claims 1-2, characterized in that, The positioning structure (11) includes a positioning groove (112), and the positioning ball (2) can be embedded in the positioning groove (112).

4. The valve core reversing structure according to claim 1, characterized in that, The positioning ball (2) is mounted on the ball seat (4), and the slide (5) is slidably sleeved on the ball seat (4) and presses the positioning ball (2) under the action of the elastic element (3). The contact surface between the slide (5) and the positioning ball (2) is a conical surface (51).

5. The valve core reversing structure according to claim 4, characterized in that, The ball seat (4) is assembled inside the end cap (6), and the ball seat (4) and the end cap (6) are connected by a snap-fit ​​connection.

6. The valve core reversing structure according to claim 5, characterized in that, The ball seat (4) has a circumferential outer edge (41) extending from its outer periphery. The circumferential outer edge (41) is snapped together with the end cap (6), and the circumferential outer edge (41) limits the slide seat (5).

7. The valve core reversing structure according to claim 1, characterized in that, A spring (7) is provided at the connection between the positioning rod (1) and the valve core (10). A first spring seat (81) and a second spring seat (82) are respectively provided at both ends of the spring (7). The first spring seat (81) and the second spring seat (82) are slidably assembled on the positioning rod (1). The outer ends of the first spring seat (81) and the second spring seat (82) are respectively limited.

8. A valve core reversing structure according to claim 7, characterized in that, The valve core (10) near the end face of the positioning rod (1) can limit the inner end of the first spring seat (81), and the positioning rod (1) has a first limiting surface (12) that can limit the inner end of the second spring seat (82).

9. A valve core reversing structure according to claim 8, characterized in that, A second limiting surface (13) is also formed on the positioning rod (1), and the second limiting surface (13) is located between the end face of the valve core (10) and the first limiting surface (12).

10. A valve core reversing structure according to claim 9, characterized in that, When the valve core (10) drives the positioning rod (1) to move in the first direction, the second limiting surface (13) can abut against the first spring seat (81) to limit the position of the valve core (10); when the valve core (10) drives the positioning rod (1) to move in the second direction, the positioning ball (2) and the positioning structure (11) cooperate to limit the position of the valve core (10).

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