Two-position three-way pilot operated directional control valve

Abstract

The application discloses a two-position three-way 35MPA hydraulic control reversing valve, which comprises a hydraulic control reversing valve body, the hydraulic control reversing valve body comprises a valve body and a valve core, oil inlet ports P and control ports X are respectively arranged in the middle of both ends of the valve body, a plurality of oil outlet ports A and oil return ports T are respectively and equidistantly arranged on both sides of the valve body, the valve core is arranged in the valve body, a filter assembly is internally mounted on one side of the valve body close to the oil inlet port P, and a detection assembly is arranged in the filter assembly. When the hydraulic control reversing valve body works, the distance between the push plate and the filter screen frame is measured by means of a range finder, so that the displacement of the valve core can be obtained, the position information of the valve core in the valve body can be obtained, the specific position of the valve core can be effectively grasped, the valve core can be ensured to slide to the correct position, the first through hole and the second through hole are arranged in correspondence with the oil outlet port A and the oil return port T respectively, and the practicability of use is improved.

Description

Technical Field

[0001] This invention relates to the technical field of hydraulic control directional valves, specifically a two-position three-way hydraulic control directional valve. Background Technology

[0002] A directional control valve is a type of valve with two or more flow patterns and two or more ports. It is used to control the flow of hydraulic oil, including opening, closing, and reversing, as well as pressure unloading and sequential action control. It relies on the relative movement of the valve core and valve body for directional control. There are two types: rotary valves and spool valves. Based on the number of working positions the valve core can occupy within the valve body, they are classified as two-position, three-position, etc.; based on the number of oil passages connected to the valve body, they are classified as two-way, three-way, four-way, and six-way, etc.; the methods of operating the valve core include manual, mechanical, electric, hydraulic, and electro-hydraulic types. In industries such as petroleum, chemical, mining, and metallurgy, hydraulically controlled directional control valves are important fluid reversing devices. By utilizing the absolute movement of the valve core relative to the valve body, the oil passage is opened, closed, or the direction of oil flow is changed, thereby enabling the hydraulic actuators and their drive mechanisms to start, stop, or change the direction of movement.

[0003] A search revealed that a typical example of a hydraulically controlled directional valve in the prior art is disclosed in CN2751169Y. This valve includes a valve sleeve with a radially arranged outlet at one end and a radially arranged port at the other end that can communicate with an oil tank and high-pressure oil respectively. An axially arranged inlet is located at the end of the valve sleeve near the outlet, and a sealed end cap is located at the other end. A valve core and a return spring are axially arranged sequentially on the inner wall of the valve sleeve near the axial inlet end. The valve core has a differential structure, meaning the effective working area on the side near the return spring is larger than the effective working area on the side near the inlet. This hydraulically controlled directional valve has low pressure loss, a simple control circuit, and is easy to integrate. Cartridge valves can be easily replaced without disassembling pipe joints, making maintenance easy. It also features a compact structure, small size, and simple and convenient installation.

[0004] The existing hydraulic directional valve does not provide feedback on the sliding distance of the valve core during operation, making it impossible to determine whether the valve core is in the ideal position. Furthermore, during oil flow, other impurities inevitably flow in with the oil, causing blockages and affecting the normal operation of the hydraulic directional valve. To address these issues, improvements to the existing equipment are necessary. Summary of the Invention

[0005] The purpose of this invention is to provide a two-position three-way hydraulic directional valve to solve the problems mentioned in the background art, such as the lack of feedback on the sliding distance of the valve core during operation, making it impossible to determine whether the valve core is in the ideal position, and the inevitable inflow of other impurities with the oil during oil flow, which can cause blockage and affect the normal operation of the hydraulic directional valve.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a two-position three-way hydraulically controlled directional valve, comprising a hydraulically controlled directional valve body,

[0007] The hydraulic directional valve body includes a valve body and a valve core. An oil inlet P and a control port X are respectively opened at the middle of both ends of the valve body. Multiple oil outlets A are equidistantly opened on the outer end of the valve body near the oil inlet P, and multiple oil return ports T are equidistantly opened on the outer end of the valve body near the control port X. The valve core is installed inside the valve body, and multiple sealing rings are equidistantly arranged on the valve core near the control port X. The outer side of the sealing rings is in contact with the inner wall of the valve body. A groove is opened inside the valve core near the control port X, and a spring is installed inside the groove. The other end of the spring passes through the valve core and the control port X and connects to one end of a pipe. The pipe is threadedly connected to the inner side of the control port X. A filter assembly is installed inside the valve body near the oil inlet P, and a detection assembly is installed inside the filter assembly. The detection assembly is threadedly connected to the other end of the valve core.

[0008] Preferably, both the inner and outer walls of the valve body are provided with anti-corrosion and wear-resistant coatings, and multiple insertion ports are equidistantly provided in the middle of the outer side of the valve body. An installation and fixing component is provided on the outer side of the insertion port, and the installation and fixing component includes a fixing sleeve. Multiple rubber blocks are equidistantly installed on the inner side of the fixing sleeve, and each rubber block is engaged with the corresponding insertion port. At the same time, the inner sides of the fixing sleeve are connected to the outer wall of the valve body through engagement rings and positioning rings, respectively.

[0009] Preferably, the inner and outer walls of the valve core are provided with anti-corrosion and wear-resistant coatings, and the valve core is made of stainless steel. At the same time, multiple first through holes and second through holes are equally spaced on both sides of the valve core.

[0010] Preferably, the position of the first through hole corresponds to the position of the oil outlet A, and the position of the second through hole corresponds to the position of the oil return port T.

[0011] Preferably, the filter assembly includes a threaded ring and a filter screen frame, and the threaded ring is an annular structure. The external thread on the outer side of the threaded ring is threadedly connected to the internal thread on the inner side of the oil inlet P. The filter screen frame is provided on the side of the threaded ring near the valve core, and the side of the filter screen frame away from the threaded ring is connected to the positioning groove on the valve core.

[0012] By adopting the above technical solution, it is convenient to filter the oil in the oil inlet P to prevent impurities from entering the valve body and damaging the valve core, thus affecting its use.

[0013] Preferably, the detection component includes a push plate, a push rod, a rubber sleeve, and a rangefinder. The push plate is disposed inside the threaded ring, and the push rod is threadedly connected to the middle of the inner side of the push plate. At the same time, the other end of the push rod passes through the middle of the filter screen frame and is threadedly connected to the middle of the inner side of one end of the valve core. A rubber sleeve is disposed on the outer side of the connection between the push plate and the push rod, and a rangefinder is symmetrically disposed on one side of the push plate about the push rod.

[0014] By adopting the above technical solution, it is convenient to measure the distance the valve core moves, so that the oil outlet A corresponds to the first through hole and the oil return port T corresponds to the second through hole, thereby realizing the circulation of oil through the oil outlet A and the oil return port T.

[0015] Preferably, the outer diameter of the push plate is the same as the inner diameter of the threaded ring, and the push plate and the threaded ring are slidably connected.

[0016] Compared with the prior art, the beneficial effects of the present invention are: the two-position three-way hydraulic control directional valve,

[0017] (1) In order to solve the problem that the existing hydraulic directional valve does not provide feedback on the sliding distance of the valve core during operation and cannot determine whether the position of the valve core is the ideal position, this application is equipped with a detection component. When the hydraulic directional valve body is working, the distance between the push plate and the filter screen frame is measured by the rangefinder, thereby obtaining the displacement of the valve core and the position information of the valve core in the valve body. This can effectively grasp the specific position of the valve core and ensure that the valve core can slide to the correct position, so that the first through hole and the second through hole are respectively set to correspond to the oil outlet A and the oil return T, thereby improving the practicality of use.

[0018] (2) In order to solve the problem that when the existing hydraulic directional valve is in the process of oil flow, other impurities will inevitably flow in with the oil, causing blockage and affecting the normal operation of the hydraulic directional valve, this application fixes the filter screen frame inside the oil inlet P with a threaded ring, so that the purity of the oil entering the valve body through the oil inlet P is improved, thereby avoiding other impurities from flowing in with the oil and causing blockage, and improving the practicality of use.

[0019] (3) In order to solve the problem that the existing hydraulic directional valve is not securely fixed and is prone to loosening during use, thus affecting the performance, this application sets a fixing sleeve, a rubber block, a snap ring and a positioning ring together to make the hydraulic directional valve body less likely to be damaged when fixed by fixing bolts during use, and at the same time, it is firmly fixed and not prone to loosening, thus improving the stability of use. Attached Figure Description

[0020] Figure 1 This is a frontal cross-sectional view of the present invention.

[0021] Figure 2 This is a front view structural diagram of the hydraulic control directional valve body of the present invention;

[0022] Figure 3 This is a top-view three-dimensional structural diagram of the hydraulic control directional valve body of the present invention;

[0023] Figure 4 This is a side-view three-dimensional structural diagram of the hydraulic control directional valve body of the present invention;

[0024] Figure 5 This is an exploded front view of the hydraulic control directional valve body of the present invention;

[0025] Figure 6 This is an exploded side view of the hydraulic control directional valve body of the present invention.

[0026] In the diagram: 1. Valve body; 101. Insertion port; 2. Oil inlet P; 3. Control port X; 4. Oil outlet A; 5. Oil return port T; 6. Valve core; 7. Sealing ring; 8. First through hole; 9. Second through hole; 10. Spring; 11. Threaded ring; 12. Filter screen frame; 13. Push plate; 14. Push rod; 15. Rubber sleeve; 16. Rangefinder; 17. Fixing sleeve; 18. Rubber insert; 19. Engaging ring; 20. Positioning ring. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1-6 The present invention provides a technical solution: a two-position three-way hydraulically controlled directional valve, according to... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the hydraulic directional valve body includes a valve body 1 and a valve core 6. An oil inlet P2 and a control port X3 are respectively opened at the middle of both ends of the valve body 1. Multiple oil outlets A4 are equidistantly opened on the outer end of the valve body 1 near the oil inlet P2, and multiple oil return ports T5 are equidistantly opened on the outer end of the valve body 1 near the control port X3. The valve core 6 is installed inside the valve body 1, and multiple sealing rings 7 are equidistantly arranged on the side of the valve core 6 near the control port X3. The outer side of the sealing rings 7 is in contact with the inner wall of the valve body 1. Both the inner and outer walls of the valve core 6 are provided with... The valve core 6 is made of stainless steel and has a corrosion-resistant and wear-resistant coating. Multiple first through holes 8 and second through holes 9 are equally spaced on both sides of the valve core 6. The position of the first through hole 8 corresponds to the position of the oil outlet A4, and the position of the second through hole 9 corresponds to the position of the oil return port T5. A groove is provided inside the valve core 6 near the control port X3, and a spring 10 is installed inside the groove. The other end of the spring 10 passes through the valve core 6 and the control port X3 and is connected to one end of the pipeline. The pipeline is threaded to the inside of the control port X3.

[0029] To further explain, both the inner and outer walls of the valve body 1 are coated with anti-corrosion and wear-resistant coatings. Multiple insertion ports 101 are equidistantly spaced on the outer side of the valve body 1. An installation and fixing assembly is provided on the outer side of each insertion port 101. This assembly includes a fixing sleeve 17, on the inner side of which multiple rubber blocks 18 are equidistantly installed. Each rubber block 18 engages with its corresponding insertion port 101. Simultaneously, the inner sides of the fixing sleeve 17 are connected to the outer wall of the valve body 1 via engaging rings 19 and positioning rings 20, respectively. This facilitates the installation and fixing of the valve body 1 while minimizing damage, thus improving its practicality.

[0030] according to Figure 1 , Figure 4 , Figure 5 and Figure 6As shown, a filter assembly is installed inside the valve body 1 near the oil inlet P2. The filter assembly includes a threaded ring 11 and a filter screen 12. The threaded ring 11 has an annular structure, and the external thread on the outer side of the threaded ring 11 is threaded to the internal thread on the inner side of the oil inlet P2, facilitating the installation and fixation of the filter screen 12. The filter screen 12 is located on the side of the threaded ring 11 near the valve core 6, which facilitates the filtration of the oil at the oil inlet P2, preventing impurities from entering the valve body 1 and improving the cleanliness of the oil. The side of the filter screen 12 away from the threaded ring 11 is connected to the positioning groove of the valve core 6. A detection component is installed inside the filter assembly, and the detection component is threaded to the other end of the valve core 6. The detection component includes... The device includes a push plate 13, a push rod 14, a rubber sleeve 15, and a rangefinder 16. The push plate 13 is located inside the threaded ring 11, and the outer diameter of the push plate 13 is the same as the inner diameter of the threaded ring 11. The push plate 13 and the threaded ring 11 are slidably connected. The push rod 14 is threadedly connected to the inner middle of the push plate 13. The other end of the push rod 14 passes through the middle of the filter screen frame 12 and is threadedly connected to the inner middle of one end of the valve core 6. A rubber sleeve 15 is provided on the outer side of the connection between the push plate 13 and the push rod 14. The rangefinder 16 is symmetrically arranged on one side of the push plate 13 about the push rod 14 to facilitate the measurement of the length of the movement position of the valve core 6, so that the valve core 6 can slide to the correct position and improve the practicality of use.

[0031] In use, the control port X3 is under high pressure in the normal position. The multiple first through holes 8 and second through holes 9 on the valve core 6 are respectively set to correspond to the positions of the oil outlet A4 and the oil return port T5. The oil is discharged from the valve body 1 through the oil outlet A4 and enters the valve body 1 through the oil return port T5. In the working position, the control port X3 is under low pressure. The oil pushes the push plate 13 to move towards the filter screen frame 12 inside the threaded ring 11 through the oil inlet P2. At the same time, the push rod 14 pushes the valve core 6 to squeeze the spring 10 to move towards the control port X3. At the same time, the rangefinder 16 measures the distance between the push plate 13 and the filter screen frame 12 to determine the distance the valve core 6 has moved. Then the oil enters the valve body 1 through the oil inlet P2, is filtered by the filter screen frame 12, and is discharged from the oil outlet A4.

[0032] The terms “center,” “longitudinal,” “lateral,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing the present invention 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 limiting the scope of protection of the present invention.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A two-position three-way hydraulically controlled directional valve, comprising a hydraulically controlled directional valve body, characterized in that: The hydraulic directional valve body includes a valve body (1) and a valve core (6). An oil inlet P (2) and a control port X (3) are respectively opened at the middle of both ends of the valve body (1). Multiple oil outlets A (4) are equidistantly opened on the outer end of the valve body (1) near the oil inlet P (2), and multiple oil return ports T (5) are equidistantly opened on the outer end of the valve body (1) near the control port X (3). A valve core (6) is installed inside the valve body (1), and multiple sealing rings (7) are equidistantly arranged on the side of the valve core (6) near the control port X (3). The outer side of the sealing ring (7) is in contact with the inner wall of the valve body (1). The valve core (6) has a groove on the side near the control port X (3), and a spring (10) is installed inside the groove. At the same time, the other end of the spring (10) passes through the valve core (6), the control port X (3) and is connected to one end of the pipeline. The pipeline is threaded to the inside of the control port X (3). A filter assembly is installed inside the valve body (1) on the side near the oil inlet P (2), and a detection assembly is installed inside the filter assembly. At the same time, the detection assembly is threaded to the other end of the valve core (6). The filter assembly includes a threaded ring (11) and a filter screen (12). The threaded ring (11) is an annular structure. The external thread on the outside of the threaded ring (11) is threadedly connected to the internal thread on the inside of the oil inlet P (2). The filter screen (12) is provided on the side of the threaded ring (11) near the valve core (6), and the side of the filter screen (12) away from the threaded ring (11) is connected to the positioning groove on the valve core (6). The detection assembly includes a push plate (13), a push rod (14), a rubber sleeve (15), and a rangefinder (16). The push plate (13) is located inside the threaded ring (11), and the push rod (14) is threadedly connected to the middle of the inner side of the push plate (13). At the same time, the other end of the push rod (14) passes through the middle of the filter screen frame (12) and is threadedly connected to the middle of the inner side of one end of the valve core (6). A rubber sleeve (15) is provided on the outer side of the connection between the push plate (13) and the push rod (14), and the rangefinder (16) is symmetrically arranged on one side of the push plate (13) about the push rod (14).

2. The two-position three-way hydraulic control directional valve as described in claim 1, characterized in that: The valve body (1) has a corrosion-resistant and wear-resistant coating on both its inner and outer walls. Multiple insertion ports (101) are provided at equal intervals on the outer side of the valve body (1). An installation and fixing component is provided on the outer side of the insertion port (101). The installation and fixing component includes a fixing sleeve (17). Multiple rubber blocks (18) are installed at equal intervals on the inner side of the fixing sleeve (17). Each rubber block (18) is engaged with the corresponding insertion port (101). At the same time, the two sides of the fixing sleeve (17) are connected to the outer wall of the valve body (1) through a locking ring (19) and a positioning ring (20).

3. The two-position three-way hydraulic control directional valve as described in claim 1, characterized in that: The valve core (6) has a corrosion-resistant and wear-resistant coating on both its inner and outer walls, and the valve core (6) is made of stainless steel. At the same time, multiple first through holes (8) and second through holes (9) are equally spaced on both sides of the valve core (6).

4. The two-position three-way hydraulic control directional valve as described in claim 3, characterized in that: The position of the first through hole (8) is set to correspond to the position of the oil outlet A (4), and the position of the second through hole (9) is set to correspond to the position of the oil return port T (5).

5. The two-position three-way hydraulic control directional valve as described in claim 1, characterized in that: The outer diameter of the push plate (13) is the same as the inner diameter of the threaded ring (11), and the push plate (13) and the threaded ring (11) are slidably connected.

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