Prefill valve
By designing a liquid filling valve, the automatic switching control of pressure oil is achieved by using the switching valve part and the pilot control part, the problem of the need for a separate hydraulic circuit for replenishing the accumulator in the prior art is solved, the system cost and failure rate are reduced, and the system is improved. The reliability and sensitivity of the system.
Patent Information
- Application Number
- CN202420384590.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-28
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2034-02-28
AI Technical Summary
The existing accumulator flush replenishment requires separate hydraulic circuit control, resulting in high system cost, cumbersome control and high failure rate.
A liquid filling valve is designed, including a valve body, a switching valve part, a check valve part and a pilot control part. By switching the valve part, the pressure oil is controlled to switch between the liquid filling port and the working port, and the pilot control part is automatically realized Switch control to avoid separate hydraulic circuit settings.
Automatic switching control of the liquid filling valve is realized, reducing the pressure loss of the system, improving reliability and sensitivity, and not affecting the oil supply work of the subsequent working device.
Smart Images
Figure CN222277069U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of hydraulic systems, in particular to a liquid filling valve. Background Art
[0002] The accumulator is an energy storage device in the hydraulic and pneumatic system. It converts the energy in the system into compression energy or potential energy and stores it at the right time. When the system needs it, it converts the compression energy or potential energy into hydraulic or air pressure energy and releases it to replenish the system. When the system pressure increases instantly, it can absorb this part of the energy to ensure the normal pressure of the entire system.
[0003] In a hydraulic system, in order to ensure the normal use of the accumulator, it is usually necessary to provide energy to the accumulator. In the prior art, a separate hydraulic circuit is usually required to control the flushing or replenishing of the accumulator, and the separate hydraulic circuit cannot be used to supply oil to the normal working device, and the control of flushing and replenishing is cumbersome. Utility Model Content
[0004] The technical problem to be solved by the utility model is that the existing accumulator charging and refilling requires separate hydraulic circuit control, which increases the system cost. The existing control requires the cooperation of multiple sensors, the control is cumbersome and the failure rate is high. The utility model provides a filling valve to solve the above problems.
[0005] The technical solution adopted by the utility model to solve its technical problems is: a filling valve, including a valve body, the valve body is provided with a pressure oil inlet P, a working port N, a filling port S and an oil return port T, the valve body is provided with a switching valve part, a one-way valve part and a pilot control part, the filling port S is arranged at the outlet of the one-way valve part, the working port N and the inlet of the one-way valve part are connected with the pressure oil inlet P through the switching valve part, and the pilot control part controls the switching of the connection state between the pressure oil inlet P and the working port N or the filling port S.
[0006] Further: the switching valve part includes a switching valve hole arranged at the bottom of the pressure oil inlet P and a switching valve core arranged in the switching valve hole; a first oil channel connected to the working port N and a second oil channel connected to the one-way valve part are provided on the hole wall of the switching valve hole, and the switching valve core slides along the switching valve hole and adjusts the flow area of the first oil channel and the second oil channel; a switching spring is provided on the back of the switching valve core, and the switching spring pushes the switching valve core toward the pressure oil inlet P.
[0007] Further: the one-way valve portion includes a one-way valve hole connected to the second oil channel, a one-way valve seat, a spring seat arranged at the mouth of the one-way valve seat, a one-way valve core installed in the spring seat, and a one-way valve spring installed in the spring seat and pushing the one-way valve core toward the one-way valve seat, and the inner cavity of the spring seat is connected to the liquid filling port S.
[0008] Further: the pilot control part includes a pilot valve hole and a pilot valve stem installed in the pilot valve hole, the back of the switching valve core is connected to the pilot oil circuit, and the pilot valve stem moves in the pilot valve hole to switch the connection state between the pilot oil circuit and the pressure oil inlet P or the return oil port T; the lower end of the pilot valve stem is provided with a pressure switching part, and the upper end is provided with an adjusting spring; the pressure switching part includes a piston and a return spring installed in the piston, and the bottom of the piston is connected to the filling port S.
[0009] The beneficial effect of the utility model is that the filling valve of the utility model controls the pressure oil to switch between the filling port and the working port through the switching valve part, and realizes automatic switching control according to the change of the pressure value of the filling port through the pilot control part. After the filling is completed, the pressure loss of the filling valve itself is low, and the oil supply work of the subsequent working device is not affected. There is no need to set up a hydraulic circuit separately, and the pilot control switching is sensitive and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0011] Figure 1 This is a schematic diagram of the structure of the liquid filling valve of the utility model;
[0012] Figure 2 It is a structural schematic diagram of the one-way valve part;
[0013] Figure 3 It is a schematic diagram of the hydraulic system.
[0014] In the figure, 1, valve body, 2, pressure oil inlet P, 3, working port N, 4, filling port S, 5, oil return port T, 6, switching valve part, 7, one-way valve part, 8, pilot control part, 9, switching valve core, 10, first oil channel, 11, second oil channel, 12, switching spring, 13, one-way valve seat, 14, spring seat, 15, one-way valve core, 16, one-way valve spring, 17, pilot valve stem, 18, pilot oil circuit, 19, adjusting spring, 20, piston, 21, return spring. DETAILED DESCRIPTION
[0015] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.
[0016] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships 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.
[0017] In addition, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "multiple" means two or more.
[0018] Any process or method description in the flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.
[0019] like Figures 1 to 3As shown, the utility model provides a filling valve, including a valve body 1, on which a pressure oil inlet P2, a working port N3, a filling port S4 and an oil return port T5 are arranged, and a switching valve part 6, a one-way valve part 7 and a pilot control part 8 are arranged in the valve body 1, the filling port S4 is arranged at the outlet of the one-way valve part 7, the working port N3 and the inlet of the one-way valve part 7 are connected with the pressure oil inlet P2 through the switching valve part 6, and the pilot control part 8 controls the switching of the connection state between the pressure oil inlet P2 and the working port N3 or the filling port S4.
[0020] The switching valve portion 6 includes a switching valve hole arranged at the bottom of the pressure oil inlet P2 and a switching valve core 9 arranged in the switching valve hole; a first oil passage 10 connected to the working port N3 and a second oil passage 11 connected to the one-way valve portion 7 are provided on the hole wall of the switching valve hole, and the switching valve core 9 slides along the switching valve hole and adjusts the flow area of the first oil passage 10 and the second oil passage 11; a switching spring 12 is provided on the back of the switching valve core 9, and the switching spring 12 pushes the switching valve core 9 toward the pressure oil inlet P2.
[0021] The one-way valve portion 7 includes a one-way valve hole connected to the second oil channel 11, a one-way valve seat 13, a spring seat 14 arranged at the mouth of the one-way valve seat 13, a one-way valve core 15 installed in the spring seat 14, and a one-way valve spring 16 installed in the spring seat 14 and pushing the one-way valve core 15 toward the one-way valve seat 13, and the inner cavity of the spring seat 14 is connected to the filling port S4.
[0022] The pilot control part 8 includes a pilot valve hole and a pilot valve stem 17 installed in the pilot valve hole. The back of the switching valve core 9 is connected to a pilot oil circuit 18. The pilot valve stem 17 moves in the pilot valve hole to switch the connection state between the pilot oil circuit 18 and the pressure oil inlet P2 or the return oil port T5. The lower end of the pilot valve stem 17 is provided with a pressure switching part, and the upper end is provided with an adjusting spring 19. The pressure switching part includes a piston 20 and a return spring 21 installed in the piston 20. The bottom of the piston 20 is connected to the filling port S4.
[0023] There are usually two stages of working process in the use of the charging valve. One is that the pump flow enters the accumulator through the charging valve, and the accumulator is filled until the specified pressure is reached, then the charging valve is switched, and the pump flow enters the working port N3, which is also called the filling process; the other is that when the accumulator pressure value drops to the lower limit setting value, the charging valve switches the pressure oil originally provided by the pump flow to the working device to flow into the accumulator, which is also called the replenishing process.
[0024] During the filling process, the pressure oil of the pump flow flows in from the pressure oil inlet P2, and pushes the switching valve core 9 upwards, and the oil flows into the one-way valve seat 13. Further, the pressure oil in the one-way valve seat 13 pushes open the one-way valve core 15 which is one-way sealed at the mouth of the one-way valve seat 13, and the oil flows into the filling port S4 and fills the accumulator connected to the filling port S4.
[0025] During this process, it can be seen from the system schematic diagram that the switching valve part 6 is connected in the left position, the pressure oil inlet P2 and the working port N3 are in the disconnected state, and all the oil flows into the filling port S4. The pilot control part 8 is connected in the right position, and part of the pressure oil enters the switching valve part 6 and the left control oil circuit of the pilot control part 8 from the pressure oil inlet P2, which serves to maintain the filling state of the left-connected switching valve part 6 and the pilot control part 8, and to accumulate the potential energy of the valve core switching of the pilot control part 8, so as to prepare for the position switching of the pilot valve stem 17 of the pilot control part 8.
[0026] As the pressure in the accumulator gradually increases, that is, the oil pressure in the filling port S4 increases until it reaches the set value, the position of the pilot valve stem 17 of the pilot control unit 8 is switched, and the left position of the pilot control unit 8 is connected. The original pilot oil circuit 18 and the pressure oil inlet P2 are connected, and now it is changed to the connection of the pilot oil circuit 18 or the return oil port T5, so that the pressure of the pilot oil circuit 18 is relieved, and the pressure imbalance at both ends of the switching valve core 9 of the switching valve unit 6 causes the right position of the switching valve unit 6 to be connected. At this time, the pressure oil inlet P2 and the working port N3 are connected, and the flow of the pump is guided to the subsequent working device connected to the working port N3. The load pressure of the subsequent working device is lower than the set pressure of the accumulator. Then the one-way valve unit 7 is closed, the filling process is completed, and the pump flow flows through the filling valve at a lower △P.
[0027] During the fluid replenishment process, when the accumulator pressure value drops below the lower limit, that is, the pressure value of the filling port S4 drops below the set value. Prior to this, the force state of the pilot valve stem 17 of the pilot control unit 8 when the lower filling is completed is explained. When the filling is completed, the left position of the pilot control unit 8 is connected. At this time, the interaction force applied by the pressure switching unit and the regulating spring 19 on the pilot valve stem 17 is balanced. At this time, the thrust of the pressure switching unit pushing the pilot valve stem 17 upward is also the largest. The upward thrust of the pressure switching unit is mainly composed of the pressure generated by the oil in the filling port S4 and the force of the reset spring 21. When the pressure value of the filling port S4 drops below the set value, the upward thrust of the pressure switching part on the pilot valve stem 17 drops to the lower limit value. Under the action of the adjusting spring 19, the pilot valve stem 17 moves downward, and the pilot control part 8 is switched from the left position to the right position. At this time, the oil in the pressure inlet P2 will be connected to the back of the switching valve core 9, and the switching valve part 6 will be switched back to the left position. The pressure inlet P2 will be connected to the filling port S4 again for filling until the pressure in the accumulator reaches the set upper limit.
[0028] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0029] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A filling valve, comprising a valve body (1), wherein the valve body (1) is provided with a pressure oil inlet P (2), a working port N (3), a filling port S (4) and an oil return port T (5), wherein: The valve body (1) is provided with a switching valve portion (6), a one-way valve portion (7) and a pilot control portion (8); the filling port S (4) is provided at the outlet of the one-way valve portion (7); the working port N (3) and the inlet of the one-way valve portion (7) are connected to the pressure oil inlet P (2) via the switching valve portion (6); and the pilot control portion (8) controls the switching of the connection state between the pressure oil inlet P (2) and the working port N (3) or the filling port S (4).
2. A filling valve according to claim 1, characterized in that: The switching valve portion (6) comprises a switching valve hole arranged at the bottom of the pressure oil inlet port P (2) and a switching valve core (9) arranged in the switching valve hole; A first oil passage (10) communicating with the working port N (3) and a second oil passage (11) communicating with the one-way valve portion (7) are provided on the hole wall of the switching valve hole, and the switching valve core (9) slides along the switching valve hole and adjusts the flow areas of the first oil passage (10) and the second oil passage (11); A switching spring (12) is provided on the back of the switching valve core (9), and the switching spring (12) pushes the switching valve core (9) toward the pressure oil inlet P (2).
3. A filling valve according to claim 2, characterized in that: The one-way valve portion (7) comprises a one-way valve hole connected to the second oil passage (11), a one-way valve seat (13), a spring seat (14) arranged at the mouth of the one-way valve seat (13), a one-way valve core (15) installed in the spring seat (14), and a one-way valve spring (16) installed in the spring seat (14) and pushing the one-way valve core (15) toward the one-way valve seat (13); the inner cavity of the spring seat (14) is connected to the liquid filling port S (4).
4. A filling valve according to claim 3, characterized in that: The pilot control part (8) comprises a pilot valve hole and a pilot valve stem (17) installed in the pilot valve hole; the back of the switching valve core (9) is connected to a pilot oil circuit (18); the pilot valve stem (17) moves in the pilot valve hole to switch the connection state between the pilot oil circuit (18) and the pressure oil inlet port P (2) or the oil return port T (5); a pressure switching part is arranged at the lower end of the pilot valve stem (17), and an adjusting spring (19) is arranged at the upper end; the pressure switching part comprises a piston (20) and a return spring (21) installed in the piston (20); the bottom of the piston (20) is connected to the filling port S (4).