A manually operated reversing valve

Abstract

The utility model belongs to the technical field of hydraulic components, disclose a kind of hand reversing valve, comprising: valve seat, installation cavity is formed in valve seat;Valve bush, valve bush is connected with valve seat, valve cavity is formed in valve bush, and oil inlet and oil outlet that valve bush is opened with valve cavity communication along axial direction;Spool, spool is distributed with oil passage along axial direction;Manual valve stem, manual valve stem is arranged in valve seat, and the end of manual valve stem that extends into installation cavity is fixedly connected with spool;Adjusting assembly, adjusting assembly is installed in installation cavity, and adjusting assembly includes locking piece and reset piece, locking piece is used to fixedly connected manual valve stem and spool, and locking piece is limited with valve seat and realizes axial position;Valve bush is opened with multiple limit slots along circumference, and spool is opened with multiple groups of oil passage along axial direction, and each group of oil passage is provided with multiple along the circumference of spool, to realize the oil path switching between oil inlet and multiple oil outlets after manual valve stem and adjusting assembly cooperate and circumferential rotation.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic components, and in particular to a manual directional valve. Background Technology

[0002] A directional control valve is a control element in a hydraulic system. Its function is to control the flow of hydraulic oil to the actuator, thereby controlling the direction of movement of the actuator, such as starting, stopping, forward rotation, and reverse rotation. Manual directional control valves achieve oil circuit switching through manual operation and are widely used in situations requiring manual intervention, simple operation, and emergency control, such as switching actuators in tractors and harvesters, and adjusting upward and downward movements. Compared to hydraulically controlled directional control valves, manual directional control valves typically add a manual valve stem and other components for adjusting and switching the oil circuit. However, after prolonged use, the manual valve stem may become stuck or jammed, affecting the ease of adjustment for switching the oil circuit.

[0003] Therefore, a manual directional valve is needed to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide a manual directional valve that can reduce the probability of the manual valve stem getting stuck or jammed after long-term use, and make it as convenient as possible for operators to switch oil circuits by manually using the valve stem to achieve manual intervention or emergency control.

[0005] To achieve this objective, the present invention adopts the following technical solution: A manual directional valve, comprising: Valve seat, wherein an installation cavity is formed therein; A valve sleeve is connected to the valve seat. A valve cavity is formed inside the valve sleeve. The valve sleeve has an oil inlet and at least two oil outlets along the axial direction. The oil inlet and the oil outlets are both connected to the valve cavity. A spool valve is installed in the valve cavity. The spool valve has an oil passage hole along the axial direction and multiple oil passages distributed along the axial direction to cooperate with the oil inlet and the oil outlet to connect the oil passage hole. A manual valve stem, which passes through the valve seat, and one end of the manual valve stem extending into the mounting cavity is fixedly connected to the spool valve core; An adjustment assembly is installed in the mounting cavity. The adjustment assembly includes a locking member and a resetting member. The locking member is used to fix the manual valve stem and the slide valve core together. Under the force provided by the resetting member, the locking member cooperates with the valve seat to limit the axial position. The valve sleeve has multiple limiting grooves along its circumference that cooperate with the locking member, and the slide valve core has multiple sets of oil passage grooves along its axial direction. Each set of oil passage grooves has multiple grooves along the circumference of the slide valve core, so as to realize the oil circuit switching between the oil inlet and multiple oil outlets after the manual valve rod cooperates with the adjustment component and rotates circumferentially.

[0006] By adopting the above technical solution, utilizing the cooperation of the manual valve stem, locking element, and upper limit groove of the valve sleeve, as well as the cooperation of the oil passage groove, oil inlet, and oil outlet of the spool valve core, the oil passage groove, oil inlet, and oil outlet of the spool valve core can be connected or closed by circumferentially rotating the manual valve stem. This allows for switching of the oil circuit on / off state during operation. Compared to traditional manual directional valves that switch the oil circuit by adjusting the axial position of the spool valve core, this greatly reduces the probability of jamming or stuck due to frequent axial displacement of the manual valve stem and spool valve core when switching the oil circuit on / off state. At the same time, the setting of the reset element provides sufficient downward pressure for positioning the manual valve stem and spool valve core, ensuring that the function of the manual directional valve will not switch arbitrarily due to vibration after adjustment. This provides operational convenience for scenarios requiring manual intervention or emergency control.

[0007] Preferably, the locking element includes a cylindrical pin, at least a portion of which passes through the manual valve stem and the spool valve core, and the cylindrical pin extends out of the spool valve core and engages with the limiting groove for limiting.

[0008] Preferably, the reset component includes a spring seat and a reset spring. The spring seat is installed in the mounting cavity, the manual valve stem passes through the spring seat, the reset spring is sleeved on the outside of the manual valve stem, and the two ends of the reset spring abut against the spring seat and the end of the spool valve core, respectively.

[0009] Preferably, the reset component includes a spring seat, a reset spring, and a planar bearing. The spring seat is installed in the mounting cavity, the manual valve stem passes through the spring seat, the reset spring is sleeved on the outside of the manual valve stem, the mounting cavity forms a mounting platform that abuts against the planar bearing, the planar bearing is installed in the mounting cavity and has a clearance fit with the manual valve stem, and the planar bearing is located between the spring seat and the spool valve core. The two ends of the reset spring abut against the planar bearing and the spring seat respectively, and press the planar bearing against the end of the spool valve core.

[0010] Preferably, when the planar bearing abuts against the mounting platform, the distance between the end face of the slide valve core and the end face of the planar bearing is denoted as L1; The valve sleeve has a notch in the circumferential direction, and a plurality of limiting grooves are distributed in the notch in the circumferential direction. The maximum depth of the limiting groove in the axial direction is denoted as L2, where L1 is greater than L2.

[0011] Preferably, a sealing groove is provided in the mounting cavity, and a sealing ring and an elastic retaining ring are installed in the sealing groove. The spring seat abuts against the end face of the sealing groove under the action of the return spring to limit the axial position of the sealing ring and the elastic retaining ring.

[0012] Preferably, the slide valve core has a mounting hole extending radially through it, the manual valve stem has a connecting hole extending radially through it, and the cylindrical pin is clearance-fitted with the mounting hole and the connecting hole.

[0013] Preferably, the spool valve core includes a main body and a guide portion. The guide portion is located on the outer periphery of the main body and slides and guides with the inner wall of the valve sleeve. The oil passage groove and the oil channel are opened on the guide portion and are circumferentially offset. Along the axial direction of the spool valve core, an oil passage cavity is formed between adjacent guide portions. The oil passage groove connects the adjacent oil passage cavities.

[0014] Preferably, the end of the spool valve core near the manual valve stem is provided with a guide groove, the manual valve stem is clearance-fitted with the guide groove, and the diameter of the manual valve stem is larger than the inner diameter of the oil passage hole.

[0015] Preferably, the end of the manual valve stem extending out of the valve seat forms a clamping platform.

[0016] The beneficial effects of this utility model are: This invention utilizes the cooperation of a manual valve stem, locking element, and upper limit groove on the valve sleeve, as well as the cooperation of the oil passage groove, inlet, and outlet of the spool valve core. This allows the circumferential rotation of the manual valve stem to open or close the oil passage groove, inlet, and outlet of the spool valve core, thereby switching the oil circuit on / off state during operation. Compared to traditional manual directional valves that switch oil circuits by adjusting the axial position of the spool valve core, this significantly reduces the likelihood of jamming or stuck due to frequent axial displacement of the manual valve stem and spool valve core when switching oil circuit on / off states. Simultaneously, the reset element provides sufficient downward pressure for positioning the manual valve stem and spool valve core, ensuring that the manual directional valve function adjustment does not result in arbitrary switching between functions due to vibration. This provides operational convenience for scenarios requiring manual intervention or emergency control. By using a planar bearing, the excessive friction caused by axial positive pressure during the adjustment of the function after the high pressure of the oil port is connected can be effectively avoided, which would make manual valve stem adjustment difficult. At the same time, by using the design that L1 is greater than L2, the displacement distance of the spool valve core during switching is less than the reserved gap. This effectively reduces the probability of manual valve stem jamming or stuck when switching oil circuits, even when there are errors in the size of the parts. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall structure of the manual directional valve provided by this utility model; Figure 2 This is a cross-sectional view of the manual directional valve provided by this utility model. Figure 1 The perspective of the planar bearing being exploded to the point of contact with the mounting platform is used to show the maximum axial displacement L1 of the planar bearing. Figure 3 This is a schematic diagram of the valve sleeve, spool valve core, and manual valve stem of the manual directional valve provided by this utility model. Figure 4 This is a schematic diagram of the structure of the slide valve core of the manual directional valve provided by this utility model; Figure 5 This is a partial structural diagram of the limiting groove of the manual directional valve provided by this utility model; Figure 6 yes Figure 5 A magnified schematic diagram of the structure at point A in the middle.

[0018] In the picture: 1. Valve seat; 11. Mounting cavity; 12. Mounting platform; 13. Sealing groove; 14. Sealing ring; 15. Elastic retaining ring; 2. Valve sleeve; 21. Valve cavity; 22. Oil inlet; 23. Oil outlet; 24. Limiting groove; 25. Notch; 3. Spool valve core; 31. Main body; 32. Guide part; 33. Oil passage hole; 34. Oil passage channel; 35. Oil passage groove; 36. Guide groove; 37. Oil passage cavity; 41. Manual valve stem; 42. Clamping platform; 51. Cylindrical pin; 61. Spring seat; 62. Return spring; 63. Surface bearing. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0020] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0023] Manual directional control valves switch oil circuits through manual operation and are widely used in control and emergency situations requiring manual intervention and simple operation, such as switching actuators in tractors and harvesters, and raising and lowering them. Compared to hydraulically controlled directional control valves, manual directional control valves typically add components such as a manual valve stem to adjust and switch oil circuits. Traditional manual directional control valves usually consist of a valve body, valve core, and manual valve stem. Pulling the manual valve stem drives the axial displacement of the valve core, thereby switching the oil circuit between the inlet and multiple outlet ports distributed along the valve body's axis. However, after prolonged use, the manual valve stem may become stuck or jammed, affecting the ease of adjustment for switching oil circuits.

[0024] This utility model provides a manual directional valve. Through the cooperation of the manual valve stem 41, the locking element, and the upper limit groove 24 of the valve sleeve 2, as well as the cooperation of the oil passage groove 35 of the spool valve core 3 and the oil inlet 22 and oil outlet 23, the oil passage groove 35 of the spool valve core 3 and the oil inlet 22 and oil outlet 23 can be connected or closed by rotating the manual valve stem 41 in a circumferential direction. This allows for switching of the oil circuit on / off state during operation. Compared with the traditional manual directional valve that switches the oil circuit by adjusting the axial position of the spool valve core 3, this greatly reduces the probability of jamming or stuck due to frequent axial displacement of the manual valve stem 41 and the spool valve core 3 to switch the oil circuit on / off state. This provides operational convenience for scenarios where operators need to perform manual intervention or emergency control.

[0025] Reference Figures 1-6This embodiment provides a manual directional valve, including a valve seat 1, a valve sleeve 2, a spool valve 3, a manual valve stem 41, and an adjusting assembly. One end of the valve seat 1 is open and has a mounting cavity 11. The valve sleeve 2 is installed on the valve seat 1 by means of threaded engagement. The valve sleeve 2 has a valve cavity 21 opened along the axial direction. The spool valve 3 is slidably installed in the valve cavity 21 of the valve sleeve 2. The adjusting assembly includes a locking member and a resetting member. The manual valve stem 41 extends outward from the end of the valve seat 1 away from the opening and into the mounting cavity 11 and is fixedly connected to the spool valve 3 by the locking member. Under the force provided by the resetting member, the locking member cooperates with the valve seat 1 to limit the spool valve 3 in the axial position.

[0026] As one implementation method, refer to Figure 1 and Figure 2 The valve sleeve 2 has an oil outlet 23 extending through its end away from the valve seat 1. Along the axial direction from the end away from the valve seat 1 to the end closer to the valve seat 1, the valve sleeve 2 has an oil outlet 23, an oil inlet 22, and another oil outlet 23 sequentially. Multiple oil outlets 23 and oil inlets 22 are provided along each axial length, and they are evenly distributed circumferentially along the valve sleeve 2. (The number of oil outlets 23 can be increased according to the number of oil circuits required for adjustment in the specific application of the manual directional valve; here, it is taken as...) Figure 2 (The structure shown is illustrated as an example). Each oil inlet 22 and oil outlet 23 is connected to the valve chamber 21.

[0027] Reference Figure 2 and Figure 4 The spool valve core 3 has an oil passage hole 33 extending through it axially. The oil passage hole 33 communicates with the oil outlet 23 located at the end of the valve sleeve 2. The spool valve core 3 has multiple oil passages 34 distributed axially, corresponding to and cooperating with the oil inlet 22 and the oil outlet 23. The oil passages 34 are used to connect the oil inlet 22 / oil outlet 23 and the oil passage hole 33. The spool valve core 3 has multiple sets of oil grooves 35 arranged axially. These grooves are located circumferentially along the oil passages 34 of equal axial length in the spool valve core 3. The multiple oil grooves 35 are spaced apart and are used to... After the core 3 rotates circumferentially, it connects with the oil outlet 23 or the oil inlet 22. Specifically, the spool core 3 includes a main body 31 and a guide part 32. The guide part 32 is located on the outer periphery of the main body 31 and slides and guides with the inner wall of the valve sleeve 2. The oil passage groove 35 and the oil passage channel 34 are opened on the guide part 32 and are circumferentially offset. An oil passage cavity 37 is formed between adjacent guide parts 32 along the axial direction of the spool core 3. The oil passage groove 35 connects the adjacent oil passage cavity 37 to switch the connection state of each oil inlet and outlet and meet the needs of the application conditions.

[0028] Reference Figure 1 and Figure 2The manual valve stem 41, located outside the valve seat 1, has a milled end with a clamping platform 42. The clamping platform 42 is a smooth plane, used to apply external locking force after the manual directional valve is installed, thereby preventing the manual directional valve from rotating circumferentially during normal operation and affecting the oil circuit connection. A guide groove 36 is provided at one end of the spool valve core 3 near the manual valve stem 41. The other end of the manual valve stem 41 extends into the guide groove 36 and is clearance-fitted with it. The inner diameter of the guide groove 36 is larger than the inner diameter of the oil passage hole 33, and the diameter of the manual valve stem 41 is larger than the inner diameter of the oil passage hole 33. The guide groove 36 of the spool valve core 3 has a mounting hole that extends radially through it. The part of the manual valve stem 41 that extends into the guide groove 36 has a connecting hole that extends radially through it. The locking element includes a cylindrical pin 51. The cylindrical pin 51 passes through the connecting hole on the manual valve stem 41 and the mounting hole on the spool valve core 3. The cylindrical pin 51 is clearance-fitted with the connecting hole and the mounting hole to achieve relative fixation of the manual valve stem 41 and the spool valve core 3 in the axial position.

[0029] Reference Figure 2 and Figure 3 The valve sleeve 2 has a notch 25 at one end that extends into the mounting cavity 11. The notch 25 has circumferentially spaced arc-shaped limiting grooves 24 that mate with the cylindrical pin 51. One end of the cylindrical pin 51 extends into the notch 25 and is limited by the arc-shaped limiting grooves 24. The reset component includes a spring seat 61, a reset spring 62, and a plane bearing 63. The spring seat 61 is fixedly installed in the mounting cavity 11. The reset spring 62 is sleeved on the portion of the manual valve stem 41 that extends into the mounting cavity 11. A mounting platform 12 is formed within the mounting cavity 11 to limit the maximum axial displacement of the plane bearing 63. The plane bearing 63 is installed into the mounting cavity 11 along the open end of the valve seat 1 until it abuts against the mounting platform 12. Both ends of the reset spring 62 abut against the spring seat 61 and the plane bearing 63, respectively. The manual valve stem 41 passes through the plane bearing 63 and has a clearance fit with it. By using the planar bearing 63, the excessive friction caused by axial positive pressure during function adjustment after the oil port is connected under high pressure can be effectively avoided, which would make it difficult to adjust the manual valve stem 41. When the manual directional valve is in normal working condition, the return spring 62 presses the planar bearing 63 against the end face of the spool valve core 3, which in turn drives the cylindrical pin 51 to press against the limiting groove 24, providing sufficient downward pressure for positioning the manual valve stem 41 and the spool valve core 3, ensuring that the function of the manual directional valve will not switch arbitrarily due to vibration after function adjustment.

[0030] Reference Figure 2 , Figure 5 and Figure 6When the plane bearing 63 abuts against the mounting platform 12, the distance between the end face of the slide valve core 3 and the end face of the plane bearing 63 is denoted as L1, that is, the maximum axial travel of the plane bearing 63 is L1, and the maximum depth of the limiting groove 24 along the axial direction is denoted as L2, where L1 is greater than L2. This ensures that the displacement distance of the slide valve core 3 during switching is less than the reserved gap, so that even when there is a certain range of error in the part dimensions, the probability of the manual valve stem 41 sticking or jamming during oil circuit switching can still be effectively reduced.

[0031] To further reduce hydraulic oil leakage from the manual valve stem 41, a sealing groove 13 is provided in the mounting cavity 11. A sealing ring 14 and an elastic retaining ring 15 are installed in the sealing groove 13. The spring seat 61 abuts against the end face of the sealing groove 13 under the action of the return spring 62 to limit the axial position of the sealing ring 14 and the elastic retaining ring 15.

[0032] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A manually operated directional valve, characterized in that, include: Valve seat (1), wherein an mounting cavity (11) is formed in the valve seat (1); A valve sleeve (2) is connected to the valve seat (1). A valve cavity (21) is formed inside the valve sleeve (2). The valve sleeve (2) has an oil inlet (22) and at least two oil outlets (23) along the axial direction. The oil inlet (22) and the oil outlets (23) are both connected to the valve cavity (21). A spool valve (3) is installed in the valve cavity (21). The spool valve (3) has an oil passage hole (33) along the axial direction. The spool valve (3) has multiple oil passage channels (34) distributed along the axial direction to cooperate with the oil inlet (22) and the oil outlet (23) to connect the oil passage hole (33). Manual valve stem (41) is inserted through the valve seat (1), and one end of the manual valve stem (41) extending into the mounting cavity (11) is fixedly connected to the slide valve core (3); An adjustment assembly is installed in the mounting cavity (11). The adjustment assembly includes a locking member and a resetting member. The locking member is used to fix the manual valve stem (41) and the slide valve core (3) together. Under the force provided by the resetting member, the locking member cooperates with the valve seat (1) to limit the axial position. The valve sleeve (2) has multiple limiting grooves (24) that cooperate with the locking member in the circumferential direction. The slide valve core (3) has multiple sets of oil passage grooves (35) in the axial direction. Each set of oil passage grooves (35) has multiple grooves in the circumferential direction of the slide valve core (3) so that the manual valve rod (41) can cooperate with the adjustment component and rotate in the circumferential direction to realize the oil circuit switching between the oil inlet (22) and multiple oil outlets (23).

2. A manual directional valve according to claim 1, characterized in that, The locking element includes a cylindrical pin (51), at least a portion of which passes through the manual valve stem (41) and the slide valve core (3), and the cylindrical pin (51) extends out of the slide valve core (3) and engages with the limiting groove (24) for limiting.

3. A manual directional valve according to claim 2, characterized in that, The reset component includes a spring seat (61) and a reset spring (62). The spring seat (61) is installed in the mounting cavity (11). The manual valve stem (41) passes through the spring seat (61). The reset spring (62) is sleeved on the manual valve stem (41), and the two ends of the reset spring (62) abut against the ends of the spring seat (61) and the slide valve core (3), respectively.

4. A manual directional valve according to claim 2, characterized in that, The reset component includes a spring seat (61), a reset spring (62), and a plane bearing (63). The spring seat (61) is installed in the mounting cavity (11). The manual valve stem (41) passes through the spring seat (61). The reset spring (62) is sleeved on the outside of the manual valve stem (41). The mounting cavity (11) forms a mounting platform (12) that abuts against the plane bearing (63). The plane bearing (63) is installed in the mounting cavity (11) and has clearance fit with the manual valve stem (41). The plane bearing (63) is located between the spring seat (61) and the slide valve core (3). The two ends of the reset spring (62) abut against the plane bearing (63) and the spring seat (61) respectively, and press the plane bearing (63) against the end of the slide valve core (3).

5. A manual directional valve according to claim 4, characterized in that, When the planar bearing (63) abuts against the mounting platform (12), the distance between the end face of the slide valve core (3) and the end face of the planar bearing (63) is denoted as L1; The valve sleeve (2) has a notch (25) in the circumferential direction, and a plurality of limiting grooves (24) are distributed in the notch (25) in the circumferential direction. The maximum depth of the limiting groove (24) in the axial direction is denoted as L2, where L1 is greater than L2.

6. A manual directional valve according to claim 3, characterized in that, A sealing groove (13) is provided in the mounting cavity (11). A sealing ring (14) and an elastic retaining ring (15) are installed in the sealing groove (13). The spring seat (61) abuts against the end face of the sealing groove (13) under the action of the return spring (62) to limit the axial position of the sealing ring (14) and the elastic retaining ring (15).

7. A manual directional valve according to claim 2, characterized in that, The slide valve core (3) has a mounting hole extending radially through it, and the manual valve stem (41) has a connecting hole extending radially through it. The cylindrical pin (51) is clearance-fitted with the mounting hole and the connecting hole.

8. A manual directional valve according to claim 1, characterized in that, The valve core (3) includes a main body (31) and a guide (32). The guide (32) is located on the outer periphery of the main body (31) and slides and guides the valve sleeve (2) with the inner wall. The oil passage groove (35) and the oil channel (34) are opened on the guide (32) and are circumferentially offset. Along the axial direction of the valve core (3), an oil passage cavity (37) is formed between adjacent guides (32). The oil passage groove (35) connects the adjacent oil passage cavity (37).

9. A manual directional valve according to claim 1, characterized in that, The slide valve core (3) has a guide groove (36) at the end near the manual valve stem (41). The manual valve stem (41) is clearance-fitted with the guide groove (36), and the diameter of the manual valve stem (41) is larger than the inner diameter of the oil passage hole (33).

10. A manual directional valve according to claim 1, characterized in that, The end of the manual valve stem (41) extending out of the valve seat (1) forms a pressing platform (42).

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