spool valve

Abstract

The present disclosure relates to a sliding valve. The sliding valve comprises a valve body, a valve core and a reset spring, wherein the valve body is provided with a valve cavity, a working valve port and a control valve port; the valve core is slidably arranged in the valve cavity, dividing the valve cavity into a working cavity and a control cavity; the reset spring is arranged in the control cavity and is pre-pressed between the end surface of the valve core and the valve body, so that when the medium pressure entering the control cavity through the control valve port is less than or equal to the pre-tightening force of the reset spring, the valve core blocks the working valve port, or when the medium pressure is greater than the pre-tightening force of the reset spring, the valve core is pushed to slide to open the working valve port against the elastic force of the reset spring; the valve core is provided with at least one driving groove configured to drive the valve core to rotate around the axis under the action of the medium pressure. By using the sliding valve of the present disclosure, the valve core can not only reciprocate axially in the valve cavity, but also rotate around the axis of the valve core in the valve cavity, changing the frictional force state of the valve core.

Description

Technical Field

[0001] This disclosure relates to the field of control valve technology, and more particularly to a slide valve. Background Technology

[0002] A spool valve is a common component in fluid control systems, used to control the flow direction, pressure, or flow rate of fluids (such as gases or liquids). The spool valve contains a valve core within its valve chamber, which reciprocates linearly within the chamber. Changes in the position of the valve core within the valve chamber orifice alter the connection or disconnection between the various channels of the valve body, enabling the transfer of the medium within different pipelines. The pressure energy of the medium is used to drive the actuator. Spool valves are widely used in hydraulic systems, pneumatic systems, and automation control systems.

[0003] Existing spool valves primarily use linear reciprocating motion with little rotational motion. Under normal conditions, the working trajectory of the friction pair surface between the valve core and the valve cavity remains unchanged. The friction pair surface of the parts is prone to wear, resulting in uneven annular clearance between the valve core and the valve cavity. This leads to increased media leakage, and the valve core is also prone to jamming, reducing the reliability of the valve and affecting the product's service life. Summary of the Invention

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a slide valve.

[0005] According to a first aspect of this disclosure, a slide valve is provided, the slide valve comprising:

[0006] The valve body contains a valve cavity, a working valve port, and a control valve port.

[0007] A valve core is slidably disposed within the valve cavity, dividing the valve cavity into a working cavity and a control cavity;

[0008] A return spring is disposed within the control chamber and pre-pressed between the end face of the valve core and the valve body, so that when the pressure of the medium entering the control chamber through the control valve port is less than or equal to the pre-tightening force of the return spring, the valve core blocks the working valve port; or when the pressure of the medium is greater than the pre-tightening force of the return spring, the valve core is pushed to slide to open the working valve port by overcoming the elastic force of the return spring.

[0009] The valve core is provided with at least one drive groove, which is configured to drive the valve core to rotate around an axis under the action of medium pressure.

[0010] In one embodiment of this disclosure, the drive groove includes a first drive groove disposed on the end face of the valve core located within the control cavity. The first drive groove has two groove walls that extend radially and are disposed opposite to each other, and the area of ​​one groove wall is larger than the area of ​​the other groove wall.

[0011] In one embodiment of this disclosure, at least two first drive grooves are formed on the end face of the valve core located in the control cavity, and the at least two first drive grooves are arranged circumferentially around the center of the valve core.

[0012] In one embodiment of this disclosure, the projection of the first drive groove in the radial section of the valve core is fan-shaped.

[0013] In one embodiment of this disclosure, the first drive groove has an inclination angle α of 75-85° relative to the axis of the valve core in its projection within the axial plane of the valve core.

[0014] In one embodiment of this disclosure, the valve core includes a first shaft segment and a second shaft segment continuously disposed along the axial direction, wherein the diameter of the first shaft segment is smaller than the diameter of the second shaft segment.

[0015] In one embodiment of this disclosure, the valve core includes a valve stem and a sealing flange that protrudes radially on the valve stem. The sealing flange is configured to seal the working valve port. The drive groove includes a second drive groove disposed on the sealing flange. The second drive groove starts from the end face of the sealing flange toward the working valve port and extends obliquely to the peripheral wall of the sealing flange.

[0016] In one embodiment of this disclosure, the projected area of ​​the second drive groove in the axial plane of the valve core is divided into two parts relative to the axis, and the area of ​​one part is larger than the other.

[0017] In one embodiment of this disclosure, the sealing flange is provided with at least two second driving grooves, and the at least two second driving grooves are arranged circumferentially around the center of the sealing flange.

[0018] In one embodiment of this disclosure, the projection of the second drive groove in the axial section of the valve core is triangular.

[0019] In one embodiment of this disclosure, the tilt angle β of the second drive groove relative to the axis of the valve core is 15-20° within the projection of the valve core in the axial plane.

[0020] One beneficial effect of the slide valve disclosed herein is that, using the slide valve disclosed herein, the valve core can not only perform axial reciprocating motion within the valve cavity to achieve normal switching between different working valve ports, but also, when the medium enters the valve cavity and acts on the drive groove on the surface of the valve core, the pressure of the medium on the valve core along the circumferential direction is uneven. The pressure generates torque on the valve core, driving the valve core to rotate around the valve core axis within the valve cavity. This changes the frictional force state of the valve core, making the friction between the valve core and the valve cavity uniform in all directions. The valve core and the valve cavity will not be repeatedly damaged by friction in the same position, thus improving the service life of the valve body. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the present disclosure and, together with their description, serve to explain the principles of the present disclosure.

[0022] Figure 1 This is a partial cross-sectional schematic diagram of a slide valve provided in one embodiment of this disclosure;

[0023] Figure 2 This is a partial cross-sectional schematic diagram of a valve core provided in one embodiment of this disclosure;

[0024] Figure 3 yes Figure 2 A schematic cross-sectional view of the valve core along the AA direction;

[0025] Figure 4 This is a cross-sectional schematic diagram of the sealing flange of the valve core provided in one embodiment of the present disclosure.

[0026] Figures 1-4 The one-to-one correspondence between the component names and the reference numerals in the figures is as follows:

[0027] Valve chambers: 11-Working chamber; 12-Control chamber;

[0028] Valve core: 21-valve stem; 211-first drive groove; 212-first shaft section; 213-second shaft section; 22-sealing flange; 221-second drive groove;

[0029] 3-Reset spring; 4-Control lever. Detailed Implementation

[0030] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0031] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0032] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0033] In all the 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.

[0034] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0035] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0036] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0037] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0038] In this paper, when the observer is facing the spool valve, the left side is considered left and the right side is considered right. The direction of the valve core's axis extension is considered axial, and the direction of the valve core's cross-section diameter is considered radial.

[0039] Existing spool valves primarily utilize linear reciprocating motion with minimal rotational movement. This leads to wear on the friction surfaces between the spool and the valve cavity, increasing media leakage. Therefore, this disclosure provides a spool valve with an actively rotating spool valve.

[0040] For ease of understanding, please refer to the following: Figures 1-4 The specific structure and working principle of this disclosure will be described in detail with reference to the embodiments.

[0041] In one embodiment, the spool valve includes: a valve body, a valve core, and a return spring 3. The valve body is provided with a valve cavity, a working valve port, and a control valve port. The valve core is slidably disposed in the valve cavity, dividing the valve cavity into a working cavity 11 and a control cavity 12. The return spring 3 is disposed in the control cavity 12 and is pre-pressed between the end face of the valve core and the valve body, so that when the pressure of the medium entering the control cavity 12 through the control valve port is less than or equal to the pre-tightening force of the return spring 3, the valve core blocks the working valve port, or when the pressure of the medium is greater than the pre-tightening force of the return spring 3, it overcomes the elastic force of the return spring 3 and pushes the valve core to slide to open the working valve port. The valve core is provided with at least one drive groove, which is configured to drive the valve core to rotate around an axis under the action of the medium pressure.

[0042] Specifically, refer to Figure 1 , Figure 2 The valve body includes two working valve ports, A and B, a central inlet valve port P, and a control valve port. When the spool valve is not in operation, the valve core blocks both working valve ports A and B, and simultaneously divides the valve cavity into three chambers: the central working chamber 11 and the two control chambers 12 on either side. A return spring 3 is installed in the control chamber 12, and the return spring 3 is pre-pressed between the end face of the valve core and the valve body. The left control chamber 12 is hydraulically controlled, while the right control chamber 12 is electromagnetically controlled. The working chamber 11 is connected to the inlet valve port P, and the medium is discharged through either working valve port A or B. The control valve port shares a single port with the inlet valve port P, and the control chamber 12 is connected to the control valve port via control channel C.

[0043] Electromagnetic control working principle:

[0044] Inside the control chamber 12 on the right, a control rod 4 is axially mounted. The control rod 4 is made of iron core and can reciprocate axially under the influence of the magnetic field generated by the energized coil. When the magnetic field causes the control rod 4 to move to the left, it pushes the valve core to overcome the preload of the left-side return spring 3 and move axially to the left. The valve core opens the working valve port A, which connects to the oil inlet valve port P through the working chamber 11. The medium from the oil inlet valve port P flows out from the working valve port A through the working chamber 11. After the operation is completed, the control rod 4 moves to the right under the magnetic field of the energized coil, and the valve core moves to the right to return to its initial state under the elastic force of the return spring 3, sealing both working valve ports A and B.

[0045] Hydraulic control working principle:

[0046] After the medium is introduced into the control chamber 12 on the left through the control valve port C, the pressure of the medium gradually increases. When the medium pressure is greater than the preload of the return spring 3 on the right, the medium pushes the valve core to move axially to the right. The valve core opens the working valve port B and still blocks the working valve port A. The working valve port B is connected to the oil inlet valve port P through the working chamber 11. The medium in the oil inlet valve port P flows out from the working valve port B through the working chamber 11.

[0047] When switching between working valve ports A and B is required, the medium in control chamber 12 pushes the valve core to reciprocate axially within the valve chamber. If the valve core rotates very little, friction between the valve core and the valve chamber will cause wear, and the wear location will rarely change. This will lead to increased medium leakage, affecting the normal operating performance of the valve body and reducing its service life.

[0048] The valve core has at least one drive groove on its surface. The design of the drive groove causes the pressure exerted on the valve core by the medium to be uneven in all directions, especially the pressure uneven along the circumferential direction. Therefore, when the medium enters the valve cavity and acts on the drive groove, it imparts a force to the valve core to rotate around its axis. The valve core moves axially and rotates circumferentially simultaneously, resulting in uniform friction between the valve core and the valve cavity, reducing frictional damage between the valve core and the valve cavity.

[0049] It should be noted that the valve core disclosed herein can be applied to any slide valve structure, and the slide valve structure in this embodiment is only used to illustrate the principle.

[0050] Using the slide valve disclosed herein, the valve core can not only reciprocate axially within the valve cavity to achieve normal switching between working valve ports A and B, but also, as the medium enters the valve cavity, it acts on the drive groove on the surface of the valve core, causing uneven pressure on the valve core along the circumference. This pressure generates torque on the valve core, driving it to rotate around its axis within the valve cavity. This changes the frictional force state of the valve core, resulting in uniform friction between the valve core and the valve cavity in all directions. The valve core and valve cavity will not repeatedly rub against each other at the same position, thus improving the service life of the valve body.

[0051] In one embodiment, the drive groove includes a first drive groove 211, which is disposed on the end face of the valve core located in the control cavity 12. The first drive groove 211 has two groove walls that extend radially and are disposed opposite to each other, and the area of ​​one groove wall is larger than the area of ​​the other groove wall.

[0052] Specifically, at least one first drive groove 211 is formed on the end face of the valve core located at the end of the control chamber 12. The first drive groove 211 extends radially and the two opposite groove walls have unequal areas, that is, the groove surface of the first drive groove 211 is inclined relative to the radial direction, with an inclination angle β of 15-20°. When the medium enters the control chamber 12, the medium impacts the groove walls with unequal areas. The pressure on the groove wall with the larger area is lower, while the pressure on the groove wall with the smaller area is concentrated and higher. The resultant force of the two pressures generates torque on the valve core, causing the valve core to rotate circumferentially. The valve core rotates circumferentially while moving axially, so that the valve core and the valve chamber rub evenly, reducing frictional damage between the valve core and the valve chamber. The rotation direction of the valve core is not limited, nor is it necessary to reverse it, as long as the valve core rotates under the push of the medium.

[0053] In one embodiment, at least two first drive grooves 211 are formed on the end face of the valve core located in the control cavity 12, and the at least two first drive grooves 211 are arranged circumferentially around the center of the valve core.

[0054] Specifically, refer to Figure 2 The resultant force of the medium on the groove walls with unequal areas drives the valve core to rotate. However, if there is only one first drive groove 211, the impact of the medium on the inclined groove surface of the first drive groove 211 causes the valve core to tend to move radially outward, thus the rotational movement of the valve core in the valve cavity is not smooth enough. If at least two first drive grooves 211 are provided on the end face of the valve core, taking two first drive grooves 211 as an example, if these two first drive grooves 211 are symmetrically arranged around the center of the valve core, and the pressure directions of the medium on the two first drive grooves 211 are opposite, and the two pressures are not on the same straight line, then the tendency of the valve core to move radially outward is canceled out, and the valve core can rotate smoothly around the axis of the valve core. In addition, at least two first drive grooves 211 are arranged circumferentially around the center of the valve core at intervals along the edge of the valve core end face. Since the pressure of the medium on the first drive groove 211 as a whole is affected by the groove wall area, the larger the groove wall area, the greater the pressure of the medium on the at least two first drive grooves 211 as a whole. The first drive grooves 211 are arranged at the edge of the valve core end face, which can maximize the groove wall area and realize the rotational movement of the valve core under the medium pressure.

[0055] In one embodiment, the projection of the first drive groove 211 within the radial cross-section of the valve core is fan-shaped.

[0056] Specifically, since the first drive groove 211 is arranged sequentially and circumferentially around the center of the valve core, and adopts a fan-shaped cross-sectional structure, the area of ​​the first drive groove 211 can be maximized. The larger the area of ​​the first drive groove 211, the greater the pressure of the medium on the first drive groove 211 as a whole, which can better drive the valve core to rotate. The edge of the fan shape coincides with the edge of the valve core, so that the first drive groove 211 is located at the edge of the valve core end face, which can also increase the area of ​​the first drive groove 211.

[0057] In one embodiment, the first drive groove 211 has an inclination angle α of 75-85° relative to the axis of the valve core in its projection within the axial plane of the valve core.

[0058] Specifically, the inclination angle α of the first drive groove 211 relative to the axis of the valve core, i.e., the inclination angle α between the lower groove surface of the first drive groove 211 and the axis of the valve core, is 75-85°. As the inclination angle α increases, the difference in area between the two groove walls of the first drive groove 211 decreases, thus reducing the circumferential torque generated by the medium on the first drive groove 211. A decrease in the inclination angle α leads to an increase in groove depth, requiring an increase in the axial length of the valve stem 21 end, thereby increasing the valve body volume. Therefore, preferably, the inclination angle α of the first drive groove 211 relative to the axis of the valve core is 75-85°.

[0059] In one embodiment, the valve core includes a first shaft segment 212 and a second shaft segment 213 continuously arranged along the axial direction, wherein the diameter of the first shaft segment 212 is smaller than the diameter of the second shaft segment 213.

[0060] Specifically, refer to Figure 2 The first drive groove 211 is disposed on the end face of the second shaft segment 213. The area of ​​the first drive groove 211 can also be increased to improve the pressure of the medium on the first drive groove 211 as a whole, and at the same time increase the impact area of ​​the medium on the end face. The radially extending end face can play a guiding role to ensure that the valve core maintains linear movement during movement and avoids deviation.

[0061] In one embodiment, the valve core includes a valve stem 21 and a sealing flange 22 that protrudes radially on the valve stem 21. The sealing flange 22 is configured to seal the working valve port. The drive groove includes a second drive groove 221 that is disposed on the sealing flange 22. The second drive groove 221 starts from the end face of the sealing flange 22 toward the working valve port and extends obliquely to the peripheral wall of the sealing flange 22.

[0062] Specifically, refer to Figure 2The valve core consists of a valve stem 21 and two radially protruding sealing flanges 22 on the valve stem 21. The two sealing flanges 22 seal the two working valve ports A and B respectively. The axial length of the sealing flanges 22 is greater than the diameter of working valve ports A and B. The sealing flange 22 on the left extends beyond the left side of working valve port A by a greater distance than it extends beyond the right side of working valve port A, while the sealing flange 22 on the right extends beyond the left side of working valve port B by a smaller distance than it extends beyond the right side of working valve port B. That is, when the valve core moves to the right to open working valve port B, the sealing flange 22 on the left side still seals working valve port A; similarly, when the valve core moves to the left to open working valve port A, the sealing flange 22 on the right side still seals working valve port B. The two sealing flanges 22 divide the valve stem 21 into a central annular oil groove and the ends of the valve stem 21 on both sides. The annular oil groove is connected to the inlet valve port P. When the valve core moves to connect with one of the working valve ports A and B, the inlet valve port P is connected to the working valve ports A and B through the annular oil groove. A first drive groove 211 is provided on the end face of the valve stem 21 on both sides. At least one second drive groove 221 is provided on the end face of the sealing flange 22 near the annular oil groove. The groove surface starts from the end face of the sealing flange 22 towards the working valve port, that is, from the end face of the sealing flange 22 near the annular oil groove, and extends to the peripheral wall of the sealing flange 22. At the same time, the second drive groove 221 is inclined relative to the axis of the valve core.

[0063] During valve core reversal, the sudden change in medium pressure and flow rate within control chamber 12 causes pressure shock to the system, increasing frictional damage between the valve core and valve chamber, and also generating significant noise. By employing the second drive groove 221 of this disclosure, a portion of the medium flows into the second drive groove 221 first, buffering the medium pressure and slowing down the pressure and flow rate changes at the start of operation. This reduces the increased frictional damage between the valve core and valve chamber, lowering operating noise. The second drive groove 221 guides fluid flow between the sealing flange 22 and the working valve port, helping to establish pilot pressure and thus controlling the valve's opening and closing action. Simultaneously, it forms tiny flow channels when the sealing flange 22 contacts the working valve port, improving the sealing effect and preventing leakage. The inclined second drive groove 221 disperses the impact force of the fluid on the sealing flange 22, reducing excessive wear in specific areas and extending the service life of the spool valve.

[0064] In one embodiment, the projected area of ​​the second drive groove 221 in the axial plane of the valve core is divided into two parts relative to the axis, and the area of ​​one part is larger than the other.

[0065] Specifically, refer to Figure 3 , Figure 4The projected area of ​​the second drive groove 221 in the axial plane of the valve core is divided into two parts, a and b, relative to the axis, and the areas of the two parts are not equal. Since both parts a and b start from the end face of the sealing flange 22 toward the working valve port, that is, from the end face of the sealing flange 22 near the annular oil groove, and extend to the peripheral wall of the sealing flange 22, the areas of the two parts a and b are not equal, that is, the inclination of the groove surface of the two parts a and b is different, and the groove surface of the larger part has a larger inclination angle with the vertical direction.

[0066] When the medium enters the second drive groove 221, the pressure on parts a and b can be decomposed into a tangential component of the valve core, causing the valve core to rotate around its axis. This rotation alters the frictional force state of the valve core, resulting in uniform friction between the valve core and the valve cavity. This prevents repeated friction damage at the same location, thus extending the valve body's service life. Furthermore, the asymmetric design helps the spool valve quickly build up pilot pressure, accelerating the valve's opening or closing speed and improving system response performance.

[0067] like Figure 3 As shown, the area of ​​part a is larger than that of part b. This results in a larger tilt angle between part a and the vertical direction. The horizontal component of the pressure exerted by the medium on part a is smaller, while the horizontal component of the pressure exerted on part b is larger. Therefore, the direction of the resultant force is consistent with the direction of the horizontal component of the pressure exerted on part b, causing the valve core to rotate clockwise.

[0068] In another embodiment, the drive groove includes both a first drive groove 211 and a second drive groove 221. The first drive groove 211 and the second drive groove 221 work together to make the valve core rotate along the axis. The pressure at the second drive groove 221 causes the valve core to rotate in the same direction as the pressure at the first drive groove 211. The pressure at the first drive groove 211 causes the valve core to rotate clockwise. The areas of parts a and b of the second drive groove 221 are set accordingly so that they cause the valve core to rotate clockwise as well.

[0069] In one embodiment, the sealing flange 22 has at least two second drive grooves 221, and the at least two second drive grooves 221 are arranged circumferentially around the center of the sealing flange 22.

[0070] Specifically, the tangential force of the valve core drives its rotation. However, if only one force is applied, the valve core tends to move radially outward, resulting in uneven rotation within the valve cavity. The sealing flange 22 has at least two second drive grooves 221. Taking two second drive grooves 221 as an example, if these two grooves are symmetrically arranged around the center of the valve core, the pressure exerted by the medium on the two drive grooves 221 results in opposite directions of force, and these forces are not on the same straight line. This cancels out the radial outward movement of the valve core, allowing it to rotate smoothly around its axis. Therefore, at least two second drive grooves 221 are arranged circumferentially around the center of the valve core, enabling smooth rotation of the valve core under medium pressure. Furthermore, this alters the stress distribution of the sealing flange 22 during operation, preventing damage caused by localized stress concentration and extending the service life of the spool valve.

[0071] In one embodiment, the projection of the second drive groove 221 in the axial section of the valve core is triangular.

[0072] Specifically, the use of a triangular second drive groove 221 enables gradual control of the pilot pressure. As the valve core moves, the opening area of ​​the triangular groove gradually increases or decreases, thus smoothly adjusting the pilot pressure. Furthermore, the tip of the triangular groove better engages with the valve cavity, reducing leakage between different channels. The triangular groove design allows the valve core to switch quickly between different positions, improving the response speed of the spool valve.

[0073] In one embodiment, the tilt angle β of the second drive groove 221 relative to the axis of the valve core is 15-20° within the projection of the valve core in the axial plane.

[0074] Specifically, the inclination angle β of the second drive groove 221 relative to the valve core axis, i.e., the inclination angle β between the intersection of parts a and b and the valve core axis, is 15-20°. Reducing the inclination angle β can increase the inclination area of ​​the second drive groove 221, thereby increasing the component of the pressure exerted by the medium on the second drive groove 221 in the tangential direction of the valve core. This easily enables the valve core to rotate under the medium pressure.

[0075] Furthermore, to facilitate better understanding, the following section will explain in detail the use process of the slide valve disclosed herein, using actual application scenarios of slide valves as examples.

[0076] 1. With the valve core in the initial position, both working valve ports A and B are blocked;

[0077] 2. When the working valve port A needs to output the medium, under the action of the magnetic field generated by the energized coil, when the control rod 4 moves to the left along the axis, the control rod 4 pushes the valve core to overcome the preload force of the left return spring 3 and move to the left axis, and the valve core opens the working valve port A;

[0078] 3. Through the oil inlet valve P, the medium enters the annular oil groove between the two sealing flanges 22, and then enters the second drive groove 221 on the sealing flange 22. When the medium enters the second drive groove 221, the pressure on parts a and b can be decomposed into the tangential component of the valve core, and drive the valve core to rotate around the axis.

[0079] 4. Working valve port A is connected to oil inlet valve port P through working chamber 11, and the medium is delivered from working valve port A;

[0080] 5. After the work is completed, the control lever 4 moves to the right under the magnetic field of the energized coil, and the valve core moves to the right to return to its initial state under the elastic force of the return spring 3, sealing the two working valve ports A and B;

[0081] 6. When the working valve port B needs to output the medium, the medium is introduced into the control chamber 12 on the left through the control valve port C. The pressure of the medium gradually increases. When the medium pressure is greater than the preload of the right return spring 3, the medium pushes the valve core to move axially to the right. At the same time, the medium acts on the first drive groove 211 on the end face of the valve core. The first drive groove 211 has two groove walls with unequal areas. The pressure of the medium on the groove wall with a smaller area is greater than the pressure on the groove wall with a larger area. The resultant force generates torque on the valve core. While the valve core moves axially in the valve chamber, it also rotates around the valve core axis. The valve core opens the working valve port B and still blocks the working valve port A.

[0082] 7. Through the oil inlet valve P, the medium enters the annular oil groove between the two sealing flanges 22, and then enters the second drive groove 221 on the sealing flange 22. When the medium enters the second drive groove 221, the pressure on parts a and b can be decomposed into the tangential component of the valve core, and drive the valve core to rotate around the axis. The rotation direction is the same as the rotation direction of the valve core driven by the pressure of the first drive groove 211.

[0083] 8. Working valve port B is connected to oil inlet valve port P through working chamber 11, and the medium is delivered from working valve port A.

[0084] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. A slide valve characterized by, The spool valve comprises: a valve body, in which a valve cavity, a working valve port and a control valve port are arranged; a spool, which is arranged in the valve cavity in a slidable manner and separates the valve cavity into a working cavity (11) and a control cavity (12); a reset spring (3), which is arranged in the control cavity (12) and is pre-pressed between an end surface of the spool and the valve body, so that when the medium pressure entering the control cavity (12) through the control valve port is less than or equal to the pre-tightening force of the reset spring (3), the spool blocks the working valve port, or when the medium pressure is greater than the pre-tightening force of the reset spring (3), the spool is pushed to slide to open the working valve port under the action of the medium pressure and against the elastic force of the reset spring (3); the spool is provided with at least one driving groove, which is configured to drive the spool to rotate around an axis under the action of the medium pressure.

2. The slide valve of claim 1, wherein The driving groove comprises a first driving groove (211), which is arranged on an end surface of the spool located in the control cavity (12), and has two groove walls extending in a radial direction and arranged oppositely, and the area of one of the two groove walls is greater than that of the other.

3. The slide valve of claim 2, wherein, At least two first driving grooves (211) are arranged on the end surface of the spool located in the control cavity (12) in sequence and at intervals in a circumferential direction around the center of the spool.

4. The slide valve of claim 2, wherein, In a radial cross section of the spool, the projection of the first driving groove (211) is in the shape of a sector.

5. The slide valve of claim 2, wherein, In the projection in an axial plane of the spool, the inclination angle α of the first driving groove (211) relative to the axis of the spool is 75-85°.

6. The slide valve of claim 2, wherein, The spool comprises a first shaft section (212) and a second shaft section (213) arranged in sequence in an axial direction, and the diameter of the first shaft section (212) is smaller than that of the second shaft section (213).

7. The slide valve according to any one of claims 1-6, wherein The spool comprises a valve rod (21) and a blocking flange (22) arranged on the valve rod (21) and protruding in a radial direction, the blocking flange (22) is configured to block the working valve port, the driving groove comprises a second driving groove (221), which is arranged on the blocking flange (22) and starts from an end surface of the blocking flange (22) towards the working valve port side and extends obliquely to the peripheral wall of the blocking flange (22).

8. The slide valve of claim 7, wherein, The projection area of the second driving groove (221) in the axial plane of the spool is divided into two parts relative to the axis, and the area of one part is greater than that of the other.

9. The slide valve of claim 7, wherein, The blocking flange (22) is provided with at least two second driving grooves (221), and at least two second driving grooves (221) are arranged in sequence and at intervals in a circumferential direction around the center of the blocking flange (22).

10. The slide valve of claim 7, wherein, In an axial cross section of the spool, the projection of the second driving groove (221) is in the shape of a triangle.

11. The slide valve of claim 7, wherein, The second drive groove (221) has an inclination angle β of 15-20° with respect to the axis of the valve core in the projection in the axial plane of the valve core.

Images