A transmission structure for a directional valve

Abstract

This utility model discloses a transmission structure for a directional valve, relating to the field of hydraulic valve technology. It includes a valve body with a plug on one side and an intermediate valve body on the other side. A valve core is housed inside the valve body, with one end of the valve core flexibly connected to a trapezoidal nut via a wire retaining ring and a wave spring washer. An adjusting screw and a Glyd ring are located at one end of the trapezoidal nut. A steel ball and a bearing outer ring are located at the end of the adjusting screw away from the trapezoidal nut. A butterfly spring and a motor are located on one side of the bearing outer ring to eliminate axial clearance. A second sealing ring is installed at the bottom inlet and outlet of the valve body. This utility model eliminates rotational clearance between the valve core and the trapezoidal nut by connecting the wire retaining ring on one side of the valve core to the trapezoidal nut, and the wave spring washer is installed between the valve core and the trapezoidal nut with a certain pre-compression, thus improving the repeatability and positioning accuracy of the transmission.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic valve technology, and in particular to a transmission structure for a directional valve. Background Technology

[0002] In existing directional control valves, the connecting rod and valve core are connected by threads, which is a rigid connection. This requires high machining and installation accuracy. If deviation occurs, the valve core or connecting rod may easily become stuck.

[0003] The patent with publication number CN223483500U mentions a flexible connection structure inside a reversing valve. In this patent, the connector is snapped into the connection hole by a snap-fit ​​structure. An movable gap is set between the connector, the connection hole and the snap-fit ​​structure, so that there is room for movement between the connector rod and the valve core after they are connected. In the case of low machining accuracy, the connector rod and the valve core can adjust themselves through the movable space, so that the connector rod and the valve core can move smoothly in the valve body and avoid the connector rod and the valve core being stuck.

[0004] However, the flexible connection structure in the aforementioned patent has a gap between the connecting rod head and the valve core's connecting hole, and there is no structure to eliminate this gap. This results in a large axial gap in the valve core during axial movement, which affects the accurate positioning of the valve core. Therefore, a transmission structure for the reversing valve is needed to solve the above problem. Utility Model Content

[0005] The main objective of this invention is to provide a transmission structure for a reversing valve, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A transmission structure for a directional control valve includes a valve body, a plug on one side of the valve body, and an intermediate valve body on the other side of the valve body. A valve core is disposed inside the valve body, and one end of the valve core is provided with a wire retaining ring, a wave spring washer, and a trapezoidal nut. One end of the trapezoidal nut is provided with an adjusting screw and a Glyd ring. The end of the adjusting screw away from the trapezoidal nut is provided with a steel ball and a bearing outer ring. A butterfly spring and a motor are disposed on one side of the bearing outer ring. A second sealing ring is installed at the bottom inlet and outlet of the valve body.

[0008] Preferably, the plug is located at the middle of the end of the valve body away from the middle valve body, and a first sealing ring is installed at the connection between the plug and the valve body. A valve core is installed in the middle of the valve body, and a groove is provided on the outer wall of the end of the valve core away from the plug, and a steel wire retaining ring is provided inside the groove.

[0009] Preferably, the end of the valve core near the wire retaining ring is inserted into the interior of the trapezoidal nut. The end of the trapezoidal nut near the wire retaining ring has a groove, and the wire retaining ring is engaged in the groove at one end of the trapezoidal nut. The valve core is connected to the trapezoidal nut through the wire retaining ring.

[0010] Preferably, a wave spring washer is installed between the trapezoidal nut and the valve core, and the wave spring washer is pre-compressed during installation. A ball groove is provided on the outer wall of the trapezoidal nut, and a steel ball is installed inside the ball groove. There are multiple steel balls, divided into two groups, one group is installed on the outer wall of the trapezoidal nut, and the other group is installed on the outer wall of the adjusting screw.

[0011] Preferably, the trapezoidal nut is installed in the middle of the intermediate valve body, and the steel ball on the outer wall of the trapezoidal nut is installed in the ball groove on the inner wall of the intermediate valve body. The intermediate valve body is inserted into the middle of the side of the valve body away from the plug, and a third sealing ring is installed at the connection between the two. An adjusting screw is threadedly connected to the middle of the end of the trapezoidal nut away from the valve core, and the adjusting screw is located inside the intermediate valve body. A motor is installed on the side of the intermediate valve body away from the valve core, and the motor is connected to the valve body through a screw passing through the intermediate valve body.

[0012] Preferably, the adjusting screw has a mounting groove on its middle outer wall, and a Glyd ring is installed inside the mounting groove. The outer wall of the Glyd ring is in contact with the inner wall of the middle valve body. A steel ball is installed on the outer wall of the adjusting screw away from the trapezoidal nut through a ball groove, and a bearing outer ring is installed on the outside of the steel ball. A butterfly spring is installed on the side of the bearing outer ring away from the adjusting screw, and the butterfly spring is pre-compressed when installed in the motor to fix the axial position of the adjusting screw.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The steel wire retaining ring on one side of the valve core is connected to the trapezoidal nut, and the wave spring washer is installed between the valve core and the trapezoidal nut with a certain pre-compression, which eliminates the axial gap between the valve core and the trapezoidal nut and improves the repeatability of the transmission.

[0015] 2. By using two steel balls on the outer wall of the trapezoidal nut, the trapezoidal nut is installed in the ball groove in the middle of the intermediate valve body, thereby restricting the circumferential rotation of the trapezoidal nut. The limiting structure of the device is simple, and the steel balls can float to a certain extent in the radial direction. This does not require high coaxiality machining accuracy, thus improving reliability.

[0016] 3. The steel ball set on the adjusting screw ensures the rotation direction of the adjusting screw and supports the axial force of the adjusting screw. The pre-compression force of the bearing outer ring through the disc spring can counteract the axial force of the steel ball and the bearing outer ring. At the same time, the disc spring is pressed against the side of the bearing outer ring to avoid friction and wear caused by surface contact with the adjusting screw. The bearing outer ring adopts a symmetrical double-piece independent design, which improves the reliability of assembly and can withstand a large return oil back pressure. The adjusting screw is installed on the outer wall through the Glyd ring, which reduces the complexity of structural processing, improves the reliability of assembly, and thus improves the overall sealing effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model;

[0018] Figure 2 This is a structural schematic diagram of the overall cross-section of the device of this utility model;

[0019] Figure 3 This is a schematic diagram of the planar structure of the device of this utility model;

[0020] Figure 4 This is a utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0021] In the diagram: 1. Plug; 2. Valve body; 3. Valve core; 4. Trapezoidal nut; 5. Adjusting screw; 6. Intermediate valve body; 7. Bearing outer ring; 8. First sealing ring; 9. Second sealing ring; 10. Steel wire retaining ring; 11. Wave spring washer; 12. Third sealing ring; 13. Steel ball; 14. Glyd ring; 15. Disc spring; 16. Motor; 17. Screw. Detailed Implementation

[0022] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a transmission structure for a reversing valve includes a valve body 2, a plug 1 on one side of the valve body 2, and an intermediate valve body 6 on the other side of the valve body 2. A valve core 3 is disposed inside the valve body 2, and one end of the valve core 3 is provided with a wire retaining ring 10, a wave spring washer 11, and a trapezoidal nut 4. One end of the trapezoidal nut 4 is provided with an adjusting screw 5 and a Glyd ring 14. The end of the adjusting screw 5 away from the trapezoidal nut 4 is provided with a steel ball 13 and a bearing outer ring 7. A butterfly spring 15 and a motor 16 are disposed on one side of the bearing outer ring 7. A second seal is installed at the bottom inlet and outlet of the valve body 2. The plug 1 is located at the middle of the end of the valve body 2 away from the middle valve body 6, and a first sealing ring 8 is installed at the connection between the plug 1 and the valve body 2. The valve core 3 is installed in the middle of the valve body 2, and a groove is opened on the outer wall of the end of the valve core 3 away from the plug 1. A wire retaining ring 10 is installed inside the groove. The wire retaining ring 10 is installed on one side of the valve core 3 and connected to the trapezoidal nut 4. The wave spring washer 11 is installed between the valve core 3 and the trapezoidal nut 4 and is pre-compressed to eliminate the rotational gap between the valve core 3 and the trapezoidal nut 4 and improve the repeatability of the transmission.

[0024] One end of the valve core 3 near the wire retaining ring 10 is inserted into the inside of the trapezoidal nut 4. The trapezoidal nut 4 near the wire retaining ring 10 has a groove, and the wire retaining ring 10 is engaged in the groove at one end of the trapezoidal nut 4. The valve core 3 is connected to the trapezoidal nut 4 through the wire retaining ring 10. A wave spring washer 11 is installed between the trapezoidal nut 4 and the valve core 3. The wave spring washer 11 is pre-compressed during installation. A ball groove is opened on the outer wall of the trapezoidal nut 4, and a steel ball 13 is installed inside the ball groove. There are multiple steel balls 13, divided into two groups. One group is installed on the outer wall of the trapezoidal nut 4, and the other group is installed on the outer wall of the adjusting screw 5. The two valve cores 3 on the outer wall of the trapezoidal nut 4 make the trapezoidal nut 4 installed in the middle of the ball groove in the middle of the intermediate valve body 6, thereby restricting the circumferential rotation of the trapezoidal nut 4. The limiting structure of the device is simple, and the steel ball 13 can float to a certain extent in the radial direction. It does not require high coaxiality machining accuracy, thus improving reliability.

[0025] A trapezoidal nut 4 is installed in the middle of the intermediate valve body 6, and a steel ball 13 on the outer wall of the trapezoidal nut 4 is installed inside a ball groove on the inner wall of the intermediate valve body 6. The intermediate valve body 6 is inserted into the middle of the side of the valve body 2 away from the plug 1, and a third sealing ring 12 is installed at the connection between the two. An adjusting screw 5 is threadedly connected to the middle of the end of the trapezoidal nut 4 away from the valve core 3, and the adjusting screw 5 is located inside the intermediate valve body 6. A motor 16 is installed on the side of the intermediate valve body 6 away from the valve core 3, and the motor 16 is connected to the valve body 2 through the intermediate valve body 6 via a screw 17. An installation groove is opened on the middle outer wall of the adjusting screw 5, and a Gladius ring 14 is installed inside the installation groove. The outer wall of the Gladius ring 14 contacts the inner wall of the intermediate valve body 6. A steel ball 13 is installed on the outer wall of the end of the adjusting screw 5 away from the trapezoidal nut 4 through a ball groove, and a bearing outer ring 7 is installed on the outside of the steel ball 13.

[0026] A disc spring 15 is installed on the side of the bearing outer ring 7 away from the adjusting screw 5. The disc spring 15 is pre-compressed when installed on the motor 16 to fix the axial position of the adjusting screw 5. The steel ball 13 set on the adjusting screw 5 ensures the rotation direction of the adjusting screw 5 and supports the axial force of the adjusting screw 5. The pre-compression force of the disc spring 15 can counteract the axial force of the steel ball 13 on the bearing outer ring 7. At the same time, the disc spring 15 is pressed against the side of the bearing outer ring 7 to avoid friction and wear caused by surface contact with the adjusting screw 5. The bearing outer ring 7 adopts a symmetrical double-piece independent design, which improves the reliability of assembly and can withstand a large return oil back pressure. The adjusting screw 5 is installed on the outer wall through the Glyd ring 14, which reduces the complexity of structural processing, improves the reliability of assembly, and thus improves the overall sealing effect.

[0027] It should be noted that this utility model is a transmission structure for a reversing valve. In use, the valve core 3 is installed inside the valve body 2. The right side of the valve core 3 is connected to the trapezoidal nut 4 through the steel wire retaining ring 10. The wave spring washer 11 is installed between the valve core 3 and the trapezoidal nut 4 and has a certain pre-compression. Two steel balls 13 are respectively installed in the upper and lower ball grooves of the trapezoidal nut 4, and together they are installed in the ball groove in the middle valve body 6 to restrict the circumferential rotation of the trapezoidal nut 4. The left end of the adjusting screw 5 is threadedly assembled with the trapezoidal nut 4. The middle part is sealed with the middle valve body 6 through the Glyd ring 14. The right side is assembled with the bearing outer ring 7 through the steel ball 13. The bearing outer ring 7 is restricted to axial movement by the disc spring 15.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A transmission structure for a directional control valve, comprising a valve body (2), characterized in that: A plug (1) is provided on one side of the valve body (2), and an intermediate valve body (6) is provided on the other side of the valve body (2). A valve core (3) is provided inside the valve body (2), and a wire retaining ring (10), a wave spring washer (11) and a trapezoidal nut (4) are provided at one end of the valve core (3). An adjusting screw (5) and a glyph (14) are provided at one end of the trapezoidal nut (4). A steel ball (13) and a bearing outer ring (7) are provided at the end of the adjusting screw (5) away from the trapezoidal nut (4). A butterfly spring (15) and a motor (16) are provided on one side of the bearing outer ring (7). A second sealing ring (9) is installed at the bottom inlet and outlet of the valve body (2).

2. The transmission structure of a reversing valve according to claim 1, characterized in that: The plug (1) is located at the middle of the valve body (2) away from the middle valve body (6), and a first sealing ring (8) is installed at the connection between the plug (1) and the valve body (2). A valve core (3) is installed in the middle of the valve body (2), and a groove is provided on the outer wall of the end of the valve core (3) away from the plug (1), and a wire retaining ring (10) is provided inside the groove.

3. The transmission structure of a reversing valve according to claim 2, characterized in that: The valve core (3) is inserted into the trapezoidal nut (4) at one end near the wire retaining ring (10). The trapezoidal nut (4) has a slot at one end near the wire retaining ring (10), and the wire retaining ring (10) is engaged in the slot at one end of the trapezoidal nut (4). The valve core (3) is connected to the trapezoidal nut (4) through the wire retaining ring (10).

4. The transmission structure of a reversing valve according to claim 3, characterized in that: A wave spring washer (11) is installed between the trapezoidal nut (4) and the valve core (3), and the wave spring washer (11) is pre-compressed during installation. A ball groove is provided on the outer wall of the trapezoidal nut (4), and a steel ball (13) is installed inside the ball groove. There are multiple steel balls (13), which are divided into two groups. One group is installed on the outer wall of the trapezoidal nut (4) to restrict the rotation of the nut. There are two groups. The other group is installed on the outer wall of the adjusting screw (5) to fix the axial position of the adjusting screw.

5. The transmission structure of a reversing valve according to claim 3, characterized in that: The trapezoidal nut (4) is installed in the middle of the intermediate valve body (6), and the steel ball (13) on the outer wall of the trapezoidal nut (4) is installed in the ball groove on the inner wall of the intermediate valve body (6). The intermediate valve body (6) is inserted into the middle of the side of the valve body (2) away from the plug (1), and a third sealing ring (12) is installed at the connection between the two. The middle of the end of the trapezoidal nut (4) away from the valve core (3) is connected to the adjusting screw (5) by thread, and the adjusting screw (5) is located inside the intermediate valve body (6). The side of the intermediate valve body (6) away from the valve core (3) is equipped with a motor (16), and the motor (16) is connected to the valve body (2) by passing through the intermediate valve body (6) with a screw (17).

6. The transmission structure of a reversing valve according to claim 5, characterized in that: An installation groove is provided on the middle outer wall of the adjusting screw (5), and a Glyd ring (14) is installed inside the installation groove. The outer wall of the Glyd ring (14) is in contact with the inner wall of the middle valve body (6). A steel ball (13) is installed on the outer wall of the adjusting screw (5) away from the trapezoidal nut (4) through a ball groove. A bearing outer ring (7) is installed on the outside of the steel ball (13). A butterfly spring (15) is installed on the side of the bearing outer ring (7) away from the adjusting screw (5). The butterfly spring (15) is pre-compressed when installed in the motor (16) to fix the axial position of the adjusting screw (5).

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