Integrated pilot oil source valve body

Abstract

The patent discloses an integrated pilot oil source valve body, which comprises a valve body, a filter is arranged on the top of the valve body, an electromagnetic reversing valve a and an electromagnetic reversing valve b are sequentially arranged on the side of the top end of the valve body away from the filter, a one-way valve is arranged on one side of the valve body, a connecting pipe is arranged on the side of the valve body away from the one-way valve, an overflow valve is arranged on the connecting pipe, a joint is arranged on the end of the overflow valve, the connecting pipe and the joint are connected, four matching openings are formed in the side wall of the joint along the axis of the joint, and the integrated pilot oil source valve body directly integrates functional elements such as the filter, the electromagnetic reversing valve a, the electromagnetic reversing valve b, the one-way valve and the overflow valve in the same valve body, so that the external pipeline connection is greatly reduced, the overall installation space is reduced, and the risk of pipeline leakage and pressure loss is reduced.

Description

Technical Field

[0001] This patent relates to the field of pilot oil source valves, specifically an integrated pilot oil source valve body. Background Technology

[0002] In hydraulic systems (such as hydraulic control circuits in construction machinery and industrial equipment), the pilot valve is a core component for achieving precise control, and its performance directly affects the response speed, stability, and reliability of the entire hydraulic system. In existing technologies, the various functional components of the pilot valve (such as filters, solenoid directional valves, relief valves, check valves, etc.) are mostly installed in a decentralized manner, requiring connection through a large number of external pipelines.

[0003] This decentralized layout has significant drawbacks: firstly, the numerous pipeline connection points not only occupy a large amount of space and are cumbersome to install, but also greatly increase the risk of oil leakage, leading to increased system pressure loss and energy consumption; secondly, traditional connection methods between joints and connecting pipes (such as simple threaded connections) are prone to loosening under long-term vibration and high-pressure conditions, affecting sealing performance. Therefore, we propose an integrated pilot-operated oil source valve body. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this patent is to provide an integrated pilot oil source valve body.

[0005] The technical solution adopted by this patent to solve its technical problem is: an integrated pilot oil source valve body, including a valve body, a filter is installed on the top of the valve body, an electromagnetic directional valve a and an electromagnetic directional valve b are installed sequentially on the top of the valve body away from the filter, a one-way valve is installed on one side of the valve body; a connecting pipe is installed on the side of the valve body away from the one-way valve, an overflow valve is installed at the connecting pipe, a connector is installed at the end of the overflow valve, the connecting pipe and the connector are connected, four mating ports are opened along the axis of the side wall of the connector, a valve tube is installed inside the connecting pipe, a mating rod is installed on the side wall of the valve tube corresponding to the mating ports, a slide is opened on the inner wall of the mating port, a positioning hole is opened on the inner wall of the slide, a limit mechanism is vertically installed on the side wall of the mating rod, and the top of the limit mechanism is engaged in the positioning hole.

[0006] Furthermore, the limiting mechanism includes a bonding plate installed on the side wall of the mating rod, a telescopic rod installed on the side wall of the bonding plate, a universal seat installed at the end of the telescopic rod, a universal ball installed inside the universal seat, the universal ball being engaged in a positioning hole, and a spring fitted on the outside of the telescopic rod between the bonding plate and the universal seat.

[0007] Furthermore, the inner wall of the universal joint is provided with rotating cavities evenly spaced along its axis, and ball bearings are installed inside the rotating cavities, with the ball bearings fitting snugly against the universal ball.

[0008] Furthermore, a valve core is installed at the end of the connector, and a square valve tube is installed at the end of the valve tube, with the valve core and the square valve tube connected together.

[0009] Furthermore, a fastening nut is screwed onto the outside of the connector.

[0010] Furthermore, a connector is installed at the bottom end of the valve body, and a base plate is installed at the bottom end of the connector.

[0011] The beneficial effects of this patent are: An integrated pilot-operated oil source valve body integrates functional components such as a filter, solenoid directional valve a, solenoid directional valve b, check valve, and relief valve directly into the same valve body, significantly reducing external pipeline connections. This not only shrinks the overall installation space but also reduces the risk of pipeline leakage and pressure loss. All components are directly connected through internal oil circuits within the valve body, resulting in faster response times and effectively improving the control accuracy and operating efficiency of the hydraulic system. The connector and connecting pipe are assembled through the corresponding mating ports and mating rods, combined with a limiting mechanism to achieve rapid positioning. The telescopic rod, spring, and universal ball on the mating rod form an elastic limiting structure that can adaptively adapt to the positioning hole position and tightly engage, ensuring connection stability under high pressure and vibration conditions while avoiding the wear problems of traditional rigid connections. The ball bearings inside the universal seat further reduce the rotational friction of the universal ball, extending the service life of the limiting mechanism. Furthermore, disassembly and assembly only require light pressure on the universal ball to disengage from the positioning hole, making operation simple. Attached Figure Description

[0012] Figure 1 This is a front view of this patent.

[0013] Figure 2 This is a rear view of this patent.

[0014] Figure 3 This is a schematic diagram of the overflow valve of this patent.

[0015] Figure 4 This is a schematic diagram of the limiting mechanism of this patent.

[0016] Explanation of reference numerals in the attached drawings: 1. Valve body; 2. Solenoid directional valve b; 3. Solenoid directional valve a; 4. Filter; 5. Relief valve; 6. Check valve; 7. Connecting pipe; 8. Valve pipe; 9. Matching rod; 10. Limiting mechanism; 11. Square valve pipe; 12. Connector; 13. Valve core; 14. Matching port; 15. Slide rail; 16. Adhesive plate; 17. Telescopic rod; 18. Spring; 19. Universal seat; 20. Universal ball; 21. Rotating cavity; 22. Ball bearing; 23. Connecting body; 24. Base plate; 25. Fastening nut. Detailed Implementation

[0017] The present patent is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the patent. Furthermore, it should be understood that after reading the teachings of this patent, those skilled in the art can make various alterations or modifications to this patent, and these equivalent forms also fall within the scope defined by the appended claims.

[0018] See Figure 1 , Figure 2 , Figure 3 and Figure 4 This is a schematic diagram of the structure of this patent. An integrated pilot oil source valve body includes a valve body 1. A filter 4 is mounted on the top of the valve body 1. On the side of the top of the valve body 1 away from the filter 4, an electromagnetic directional valve a3 and an electromagnetic directional valve b2 are installed in sequence. A one-way valve 6 is installed on one side of the valve body 1. A connecting pipe 7 is mounted on the side of the valve body 1 away from the one-way valve 6. An overflow valve 5 is mounted at the connecting pipe 7. A connector 12 is mounted at the end of the overflow valve 5. The connecting pipe 7 and the connector 12 are connected. The side wall of the connector 12 has four mating ports 14 along its axis. A valve pipe 8 is installed inside the connecting pipe 7. A mating rod 9 is installed on the side wall of the valve pipe 8 corresponding to the mating ports 14. A slide 15 is opened on the inner wall of the mating port 14. A positioning hole is opened on the inner wall of the slide 15. A limit mechanism 10 is vertically installed on the side wall of the mating rod 9. The top of the limit mechanism 10 is engaged in the positioning hole.

[0019] In the specific implementation process, valve body 1, as the core mounting base, is integrally formed from 6061-T6 aluminum alloy or ductile iron. Its internal precision oil passages are milled by a five-axis CNC machining center to ensure the oil passage connectivity accuracy of each integrated component. Filter 4 is fixed to the top of valve body 1 via a flange, with its inlet connecting to the internal oil inlet channel of valve body 1. It filters the hydraulic oil entering the pilot system with a filtration accuracy of 10μm, effectively preventing impurities from clogging the valve core or wearing parts. Electromagnetic directional valves a3 and b2 are installed in the mounting holes at the top of valve body 1 using a cartridge design. They are arranged sequentially along the length of valve body 1 and connected to the main oil passage and actuator control interface respectively through pre-set oil passages inside the valve body. This enables directional switching of the pilot oil passage (such as controlling the high and low speeds of the travel motor, attachment movements, etc.). The valve assembly has a rated working pressure of 40 bar, adapting to the pressure requirements of the pilot system. One-way valve 6 is fixed to the side interface of valve body 1 via a threaded connection. Its conduction direction is consistent with the oil flow direction, which can prevent oil backflow and system pressure fluctuations, ensuring the stability of the oil circuit. Connecting pipe 7 is welded or threadedly sealed to valve body 1. Its internal channel is connected to the pressure relief oil circuit of valve body 1. Overflow valve 5 is assembled on the preset mounting seat of connecting pipe 7 by compression fitting or thread, and is used to monitor the oil circuit pressure in real time. When the system pressure exceeds the set threshold (e.g., 45 bar), it automatically opens to relieve pressure and avoid pipeline overpressure damage. Connector 12 is a hollow tubular structure, made of the same material as connecting pipe 7 (e.g., stainless steel). One end of it is precisely connected to valve pipe 8 of connecting pipe 7 through mating port 14, and the other end is used to connect to external pressure relief pipeline or accumulator interface. The valve tube 8 is a square tube structure that is fixed to the inner wall of the connecting tube 7 with an interference fit. The mating rods 9 on its side wall are integrally formed structures and are evenly distributed along the circumference of the valve tube 8, corresponding one-to-one with the four mating ports 14 of the connector 12. During assembly, the mating rods 9 are inserted along the slide 15. The slide 15 is a rectangular groove structure with a length that matches the mating rods 9. It is used to guide the mating rods 9 to be accurately positioned to the positioning hole. The positioning hole is a hemispherical groove that matches the top of the limiting mechanism 10, so as to realize the quick positioning and fixing of the connector 12 and the connecting tube 7.

[0020] In some technical solutions, the limiting mechanism 10 includes a bonding plate 16 installed on the side wall of the mating rod 9, a telescopic rod 17 installed on the side wall of the bonding plate 16, a universal seat 19 installed at the end of the telescopic rod 17, a universal ball 20 installed inside the universal seat 19, the universal ball 20 being engaged in the positioning hole, and a spring 18 being fitted on the outside of the telescopic rod 17 between the bonding plate 16 and the universal seat 19.

[0021] In the specific implementation process, the limiting mechanism 10 is an elastic positioning structure. The mating plate 16 is fixed to the side wall of the mating rod 9 by welding or bolting, and is set perpendicular to the mating rod 9. Its surface is polished to ensure flatness and to ensure the perpendicularity of the installation with the telescopic rod 17. The telescopic rod 17 adopts a stainless steel multi-stage telescopic structure, which can adjust its length along the axial direction. One end is welded and fixed to the mating plate 16, and the other end is connected to the universal seat 19 by threads. The spring 18 is a cylindrical helical compression spring with an elastic coefficient of 0.5-1.2 N / mm. When it is fitted outside the telescopic rod 17, it is in a pre-compressed state and can continuously apply axial thrust to the universal seat 19, so that the universal ball 20 is always tightly pressed against the inner wall of the positioning hole. The universal joint 19 has a hollow hemispherical structure with a pre-reserved mounting cavity for the universal ball 20. The universal ball 20 is made of wear-resistant alloy steel with a hard chrome plated surface. Its diameter is slightly smaller than the inner diameter of the positioning hole. During assembly, under the pushing force of the spring 18, the universal ball 20 is inserted into the positioning hole, realizing the elastic positioning of the mating rod 9 and the connector 12. During disassembly, simply press the universal ball 20 inward to compress the spring 18 and retract the telescopic rod, which will allow the universal ball 20 to disengage from the positioning hole and the connector 12 to be pulled out along the slide 15. The operation is convenient and there is no rigid wear.

[0022] In some technical solutions, the inner wall of the universal seat 19 is provided with rotating cavities 21 evenly spaced along its axis, and ball bearings 22 are installed inside the rotating cavities 21, with the ball bearings 22 fitting together with the universal ball 20.

[0023] In practical implementation, the rotating cavity 21 on the inner wall of the universal seat 19 is a spherical groove structure, evenly and equidistantly distributed (usually 3-4) along the circumferential direction of the inner wall of the universal seat 19. The diameter of the rotating cavity 21 is slightly larger than the diameter of the ball 22, ensuring that the ball 22 can roll freely within the rotating cavity. The ball 22 is made of GCr15 bearing steel, with a smooth and burr-free surface. Its number corresponds one-to-one with the rotating cavity 21. After assembly, part of the ball 22 protrudes from the inner wall of the rotating cavity 21 and fits tightly against the spherical surface of the universal ball 20. This design can convert the sliding friction between the universal ball 20 and the universal seat 19 into the rolling friction of the ball 22, greatly reducing the friction force when the universal ball 20 rotates, avoiding jamming or wear of the universal ball 20, and improving the response sensitivity of the limiting mechanism 10, ensuring stable positioning even under vibration conditions.

[0024] In some technical solutions, a valve core 13 is installed at the end of the connector 12, and a square valve tube 11 is installed at the end of the valve tube 8. The valve core 13 and the square valve tube 11 are connected.

[0025] In practical implementation, the valve core 13 is a conical sealing structure made of wear-resistant alloy steel with a nitrided surface to enhance hardness. Its conical surface is adapted to the end sealing surface of the square valve tube 11, achieving a seal through this conical fit. The square valve tube 11 and valve tube 8 are integrally formed, with a square interface at its end. The internal channel communicates with the valve tube 8. After the valve core 13 is inserted into the square valve tube 11, its conical surface fits tightly against the inner wall of the square valve tube 11, effectively preventing oil leakage from the connection between the connector 12 and the valve tube 8. Furthermore, the clearance between the valve core 13 and the square valve tube 11 is controlled within 0.01-0.03 mm, ensuring sealing performance while avoiding excessive tightness that could cause jamming, thus ensuring smooth oil flow.

[0026] In some technical solutions, the external screw of the connector 12 is fitted with a fastening nut 25.

[0027] In practical implementation, the fastening nut 25 is made of carbon steel or stainless steel, and its internal thread matches the external thread of the connector 12. The thread type is M20-M30 (matched according to the diameter of the connecting pipe 7). During assembly, the connector 12 is first positioned and fixed to the connecting pipe 7 via the mating rod 9. Then, the fastening nut 25 is screwed into the connector 12 from its free end until the end face of the nut is tightly fitted with the end face of the connecting pipe 7. The thread preload further locks the connection between the connector 12 and the connecting pipe 7, enhancing the vibration resistance of the connection. This double fixing structure (limiting mechanism + fastening nut) can effectively prevent the connector 12 from loosening under long-term high pressure and vibration conditions, ensuring the reliability of the connection. At the same time, the tightening force of the nut can be adjusted by a torque wrench, facilitating installation and maintenance.

[0028] In some technical solutions, a connector 23 is installed at the bottom of the valve body 1, and a base plate 24 is installed at the bottom of the connector 23.

[0029] In practical implementation, the connector 23 is a columnar structure made of the same material as the valve body 1. It is fixedly connected to the bottom of the valve body 1 by welding or bolts, and has pre-drilled weight-reduction holes inside to reduce the overall weight. The base plate 24 is a square or round flat plate made of Q235 steel or aluminum alloy, with 4-6 evenly distributed mounting holes on its surface. The mounting holes are oblong or round to facilitate adjustment of the installation position. The connector 23 and the base plate 24 are fixed together by welding or bolts to form an overall support structure for the valve body 1. During installation, the valve body is fixed to the equipment frame or installation platform with bolts through the mounting holes of the base plate 24. This effectively distributes the weight of the valve body, reduces vibration transmission during operation, and ensures the horizontal and vertical installation of the valve body, avoiding stress concentration or leakage in the oil circuit due to installation deviations.

[0030] It will be apparent to those skilled in the art that this patent is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this patent. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this patent is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this patent. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An integrated pilot oil source valve body, comprising a valve body (1), characterized in that: A filter (4) is installed on the top of the valve body (1). A solenoid directional valve a (3) and a solenoid directional valve b (2) are installed in sequence on the side of the top of the valve body (1) away from the filter (4). A check valve (6) is installed on one side of the valve body (1). A connecting pipe (7) is installed on the side of the valve body (1) away from the one-way valve (6). An overflow valve (5) is installed at the connecting pipe (7). A connector (12) is installed at the end of the overflow valve (5). The connecting pipe (7) and the connector (12) are connected. Four mating ports (14) are opened along the axis of the side wall of the connector (12). A valve pipe (8) is installed inside the connecting pipe (7). A mating rod (9) is installed on the side wall of the valve pipe (8) corresponding to the mating port (14). A slide (15) is opened on the inner wall of the mating port (14). A positioning hole is opened on the inner wall of the slide (15). A limit mechanism (10) is vertically installed on the side wall of the mating rod (9). The top end of the limit mechanism (10) is engaged in the positioning hole.

2. The valve body of the integrated pilot oil source valve according to claim 1, characterized in that: The limiting mechanism (10) includes a bonding plate (16) installed on the side wall of the mating rod (9), a telescopic rod (17) installed on the side wall of the bonding plate (16), a universal seat (19) installed at the end of the telescopic rod (17), a universal ball (20) installed inside the universal seat (19), the universal ball (20) being engaged in the positioning hole, and a spring (18) fitted between the bonding plate (16) and the universal seat (19) on the outside of the telescopic rod (17).

3. The valve body of the integrated pilot oil source valve according to claim 2, characterized in that: The inner wall of the universal joint (19) is provided with rotating cavities (21) evenly spaced along its axis. Ball bearings (22) are installed inside the rotating cavities (21) and are fitted to the universal ball (20).

4. The valve body of the integrated pilot oil source valve according to claim 1, characterized in that: A valve core (13) is installed at the end of the connector (12), and a square valve tube (11) is installed at the end of the valve tube (8). The valve core (13) and the square valve tube (11) are connected.

5. The valve body of the integrated pilot oil source valve according to claim 1, characterized in that: The connector (12) is externally screwed with a fastening nut (25).

6. The valve body of the integrated pilot oil source valve according to claim 1, characterized in that: A connector (23) is installed at the bottom end of the valve body (1), and a base plate (24) is installed at the bottom end of the connector (23).

Images