Load-sensitive multi-way valve element
By designing a load-sensitive multi-way valve valve core, adopting a combined structure of the main valve core and the reversing valve body, and installing a check valve at the LSA and LSB ports, the problem of holding pressure during rapid reversing of the valve core is solved, the response speed and micro-movement characteristics are improved, and the fluctuation and manufacturing difficulty are reduced.
Patent Information
- Application Number
- CN202420657921.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-02
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-04-02
AI Technical Summary
When the load-sensitive multi-way valve core is reversing quickly, the LSA and LSB will hold the pressure, which will affect the valve's response speed and micro-moving characteristics. Moreover, abnormal pressure and flow fluctuations are prone to occur when the valve port is opened.
A load-sensitive multi-way valve core is designed, adopting a combined structure of the main valve core and the reversing valve body. The main valve core is equipped with a first chamber, a second chamber, a third chamber, a working port and an LS port. The LS port includes an LSA port and an LSB port. A check valve is installed in the LSA port and LSB port. The check valve seat adopts a press-fitting and closing structure to ensure fast response during pressure relief and reduce pressure holding phenomenon.
By optimizing the valve core structure, the pressure hold phenomenon is reduced, the valve response speed and micro-moving characteristics are improved, the pressure and flow fluctuations are reduced, the manufacturing process is simplified, the valve core types are reduced, and the manufacturing cost is reduced.
Smart Images
Figure CN222650236U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydraulic control, in particular to a load-sensitive multi-way valve core. Background Art
[0002] Load-sensitive multi-way valves with LS systems are widely used in engineering machinery hydraulic systems. The multi-way valve spool is a key component of the multi-way valve, which has an important impact on the control performance and working reliability of the multi-way valve. In order to match different engineering machinery products, there are various ways to control the reversing drive of the multi-way valve, including manual reversing, hydraulic reversing, electromagnetic direct drive, etc. Due to different reversing methods and different mechanical structures, the multi-way valve spool structure is also different, and the spools used by multi-way valves with different control methods cannot be universal. When the multi-way valve spool is in use, when controlling the A and B oil ports of the multi-way valve, the multi-way valve requires different flow combinations. The combination of different reversing methods, the mid-position function of the spool, and the different A and B oil port flows results in a large variety of spool types, which brings great difficulties to the production process.
[0003] LS multi-way valves are generally designed with two cavities, LSA and LSB. These two cavities detect the pressure signals of A and B oil ports through the hollow cavity of the valve core. The two cavities are connected to the LS shuttle valve to realize the LS control function of the multi-way valve. During use, when the valve core changes direction quickly, LSA and LSB will have a pressure holding situation, which affects the response speed and micro-motion characteristics of the valve. When the valve port is just opened, it is easy to have abnormal pressure and flow fluctuations. Utility Model Content
[0004] The purpose of the utility model is to provide a load-sensitive multi-way valve core to solve the problem mentioned in the above background technology that when the valve core is quickly switched, LSA and LSB will have pressure build-up, affecting the response speed and micro-motion characteristics of the valve, and abnormal pressure and flow fluctuations are prone to occur when the valve port is just opened.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A load-sensitive multi-way valve core, comprising a main valve core and a reversing valve body for mounting the main valve core;
[0007] The main valve core is provided with a first cavity, a second cavity, a third cavity, a working port and an LS port, the LS port includes an LSA port and an LSB port, and the one-way valve is installed in both the LSA port and the LSB port;
[0008] A one-way valve seat and a steel ball are arranged in the one-way valve, and the one-way valve seat adopts a press-fit closing structure.
[0009] Preferably, a pin hole for installing a cylindrical pin is also provided on the outer wall of the main valve core.
[0010] Preferably, a pressure compensator and a manual reversing device are installed on the reversing valve body, and a screw plug is installed at the end of the manual reversing device.
[0011] Preferably, the pressure compensator is provided with P and P1 ports.
[0012] Preferably, the main valve core is also provided with a first throttle port, a second throttle port, a third throttle port and a fourth throttle port of different types.
[0013] Preferably, the third cavity is symmetrically provided on both sides of the main valve core, and a threaded groove for installing different commutators is provided in the third cavity.
[0014] Compared with the prior art, the beneficial effects of the utility model are:
[0015] 1. The load-sensitive multi-way valve core can be assembled with different connectors at the end of the valve core to match different driving modes. The installation position in the valve body can be adjusted to achieve the purpose of changing the flow design of A and B ports. It can use fewer types of valve cores, realize various switching modes, different mid-position functions, and multi-way valve control combinations with different A and B oil port flows, reduce processing and manufacturing difficulty, and save manufacturing costs.
[0016] 2. In the valve core of this load-sensitive multi-way valve, the one-way valve seat adopts a press-fit closing structure. There is no spring in the one-way valve seat, and the response is fast when the pressure is released. The one-way valve seat adopts a press-fit closing structure, and the steel ball is wrapped in the inner hole of the valve seat, which will not fall out during operation. The structure is simple and reliable. At the beginning of the reversal, the LS port corresponding to the return oil port pressure after the reversal is quickly unloaded to reduce the pressure flow fluctuation caused by the pressure holding. Different connectors can be assembled at the end of the valve core to reduce the types of valve cores and reduce the manufacturing difficulty of the multi-way valve. A one-way valve is designed in the valve core to control the LS pressure relief and optimize the response characteristics of the valve during rapid reversal. The utility model has a simple structure, fast response, reliable operation and easy use. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, further detailed explanation is provided, but the accompanying drawings do not constitute a limitation to the present invention.
[0018] Figure 1 This is a schematic diagram of the structure of the load-sensitive multi-way valve core of the utility model;
[0019] Figure 2 It is a schematic diagram of the throttle port of the load-sensitive multi-way valve core of the utility model;
[0020] Figure 3 For this utility model Figure 2 Schematic diagram of the cross-sectional structure of AA;
[0021] Figure 4 For this utility model Figure 3 A schematic diagram of the enlarged structure at position I in the middle;
[0022] Figure 5 This is a schematic diagram of the installation of the valve core of the load-sensitive multi-way valve of the utility model in the multi-way valve;
[0023] Figure 6 The utility model is a hydraulic principle diagram of a load-sensitive multi-way valve core in a multi-way valve system.
[0024] The meaning of the symbols in the figure:
[0025] 1-main valve core, 2-check valve, 3-check valve seat, 4-steel ball, 5-pin hole, 6-first cavity, 7-second cavity, 8-third cavity, 20-reversing valve body, 21-pressure compensator, 22-manual reversing device, 23-screw plug, 31-first throttling port, 32-second throttling port, 33-third throttling port, 34-fourth throttling port. DETAILED DESCRIPTION
[0026] The following will combine the embodiments of the utility model and the drawings of the specification to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] In the description of the present invention, it should be understood that the terms "center", "vertical", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0028] Load sensing multi-way valve spool, such as Figure 1-Figure 6As shown, it includes a main valve core 1 and a reversing valve body 20 for installing the main valve core 1; the main valve core 1 is provided with a first cavity 6, a second cavity 7, a third cavity 8, a working port and an LS port, the LS port includes an LSA port and an LSB port, and a check valve 2 is installed in the LSA port and the LSB port; the check valve 2 is provided with a check valve seat 3 and a steel ball 4, the check valve seat 3 adopts a press-fit closing structure, there is no spring in the check valve seat 3, and the response is fast when the pressure is released, the check valve seat 3 adopts a press-fit closing structure, and the steel ball 4 is wrapped in the inner hole of the valve seat, and it will not fall out during operation, and the structure is simple and reliable. At the beginning of the reversal, the LS port corresponding to the return oil port pressure after the reversal is quickly unloaded, reducing the pressure and flow fluctuations caused by the pressure holding, and different connectors can be assembled at the end of the valve core, reducing the types of valve cores and reducing the manufacturing difficulty of the multi-way valve. A check valve is designed in the valve core to control the LS pressure release and optimize the response characteristics of the valve when the valve is quickly reversing. The utility model has the advantages of simple structure, quick response, reliable operation and convenient use.
[0029] A one-way valve 2 is installed in both the LSA port and the LSB port to ensure the one-way flow of the fluid in a specific direction and prevent the backflow and leakage of the fluid. The one-way valve seat 3 in the one-way valve 2 adopts a press-fit closing structure, which enhances the stability and sealing of the one-way valve and further improves the working performance of the valve core. The close fit between the one-way valve seat 3 and the steel ball 4 ensures the rapid response and stable operation of the one-way valve when opening and closing. As a key component of the valve core, the steel ball 4 has excellent wear resistance and impact resistance, which ensures the long service life of the one-way valve. The reversing valve body 20 not only provides a stable installation environment for the main valve core 1, but also realizes the rapid reversing function of the valve core through its structural design. This enables the entire valve core system to respond to control signals quickly and accurately in a complex working environment and achieve precise flow and pressure regulation.
[0030] Furthermore, a pin hole 5 for installing a cylindrical pin is provided on the outer wall of the main valve core 1. The installation of the cylindrical pin enables the main valve core to maintain the correct position during operation, preventing displacement or loosening due to vibration or external force, thereby ensuring the stability and reliability of the valve core.
[0031] Specifically, the reversing valve body 20 is installed with a pressure compensator 21 and a manual reversing device 22. A screw plug 23 is installed at the end of the manual reversing device 22. The pressure compensator 21 is provided with P and P1 ports. The P and P1 ports of the pressure compensator 21 can be automatically adjusted according to the system pressure change to realize the load-sensitive function and ensure that stable flow and pressure output can be obtained under different load conditions. The manual reversing device 22 provides the possibility of manual operation, which is convenient for rapid reversing or debugging in certain situations. The installation of the screw plug 23 further enhances the sealing and stability of the manual reversing device.
[0032] It is worth noting that the main valve core 1 is also provided with first throttle ports 31, second throttle ports 32, third throttle ports 33 and fourth throttle ports 34 of different types, which provide flexible options for flow regulation. These throttle ports can be combined and configured according to actual needs to achieve regulation requirements for different flows and pressures, thereby improving the applicability and flexibility of the valve core.
[0033] In addition, the main valve core 1 has a third cavity 8 symmetrically formed on both sides thereof, and a thread groove for installing different commutators is formed in the third cavity 8, so that the valve core can adapt to the installation requirements of various commutators, and is convenient for functional expansion and upgrading. At the same time, the design of the thread groove also enhances the connection strength between the commutator and the valve core, ensuring the stability and reliability of the commutation.
[0034] The working principle of the load-sensitive multi-way valve core: the valve core is provided with throttle ports of different sizes according to different valve core mid-position functions and different A and B oil port flows. When there are second throttle ports 32 and third throttle ports 33 of different sizes on both sides, the main valve core 1 can be installed in the valve body 20 in a different direction to achieve different A and B oil port flow control. The main valve core 1 is provided with a pin hole 5 at the end, in which a cylindrical pin can be inserted, and the cylindrical pin and the end cover are used for axial positioning, which is applied to the valve core used for hydraulic reversing drive to prevent flow fluctuations caused by the rotation of the valve core. The utility model multi-way valve core can be assembled with different connectors at the end of the valve core, reducing the types of valve cores and reducing the manufacturing difficulty of the multi-way valve.
[0035] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.
Claims
1. Load-sensitive multi-way valve core, characterized by: It comprises a main valve core (1) and a reversing valve body (20) for mounting the main valve core (1); The main valve core (1) is provided with a first cavity (6), a second cavity (7), a third cavity (8), a working port and an LS port, the LS port comprises an LSA port and an LSB port, and both the LSA port and the LSB port are provided with a one-way valve (2); A one-way valve seat (3) and a steel ball (4) are arranged in the one-way valve (2); the one-way valve seat (3) adopts a press-fit closing structure.
2. The load-sensitive multi-way valve core according to claim 1, characterized in that: A pin hole (5) for installing a cylindrical pin is also provided on the outer wall of the main valve core (1).
3. The load-sensitive multi-way valve core according to claim 1, characterized in that: A pressure compensator (21) and a manual reversing device (22) are installed on the reversing valve body (20), and a screw plug (23) is installed at the end of the manual reversing device (22).
4. The load-sensitive multi-way valve core according to claim 3, characterized in that: The pressure compensator (21) is provided with P and P1 ports.
5. The load-sensitive multi-way valve core according to claim 1, characterized in that: The main valve core (1) is also provided with a first throttle port (31), a second throttle port (32), a third throttle port (33) and a fourth throttle port (34) of different types.
6. The load-sensitive multi-way valve core according to claim 1, characterized in that: The third cavity (8) is symmetrically provided on both sides of the main valve core (1), and thread grooves for installing different commutators are provided in the third cavity (8).