Large-flow filterable prefill valve

Abstract

The invention provides a high-flow filterable prefill valve, and belongs to the field of hydraulic equipment manufacturing. The valve comprises a valve body, a valve element and a filter cavity. The valve element is installed in the sealing cavity in a sliding mode, and the valve element slides up and down to close or open the sealing cavity. The oil inlet is connected with the sealing cavity through the filtering cavity; the upper end of the filtering cavity is connected with the oil inlet, and the lower end of the filtering cavity is connected with the sealing cavity; a spiral flow deflector is arranged on the inner wall of the filtering cavity; one side of the flow deflector is fixed on the inner wall of the filter cavity, and the other side of the flow deflector faces the outer wall of the filter cavity and is not in contact with the outer wall of the filter cavity; a filter screen is mounted on the inner side of the outer wall of the filter cavity; the filter screen is of a porous structure and is tightly attached to the outer wall of the filter cavity. The spiral flow guide channel is formed in the valve body, so that when high-flow hydraulic oil flows through the valve body, impurities can be adsorbed to the outer wall of the filtering cavity through the centrifugal effect, the filtering effect is achieved, the valve element does not need to be frequently replaced, and the flow cannot be reduced.

Description

Technical Field

[0001] The invention relates to a filling valve manufacturing technology, in particular to a large-flow filterable filling valve, and belongs to the technical field of hydraulic system equipment manufacturing. Background Art

[0002] The charging valve is a valve that supplies the oil output by the hydraulic pump to the accumulator so that the pressure of the accumulator is maintained within a certain range. The charging valve includes a valve body with a charging oil circuit, and the valve body is provided with a hydraulic valve located in the charging oil circuit and capable of realizing different functions. Among them, the oil of the hydraulic pump is drawn from the oil tank, and the oil in the oil tank is usually recycled, that is, the more times the oil in the oil tank circulates, the more impurities are contained in the oil, and the hydraulic pump can only build up the pressure of the oil, but cannot filter the impurities in the oil. When the hydraulic pump supplies the pressurized oil containing more impurities to the charging valve, the oil will pass through different hydraulic valves along the charging oil circuit. During the flow process, the impurities in the pressurized oil will impact a certain hydraulic valve with the oil, causing the movement of the valve core to become stuck, or even causing damage to a certain hydraulic valve. These problems will reduce the working stability of the charging valve, and even cause damage to the charging valve.

[0003] In order to ensure the working stability of different hydraulic valves in the filling valve, a method that is easy for technicians in this field to think of is to filter the oil before it flows through different hydraulic valves, such as adding filters in different hydraulic valves, or setting filters in the filling oil circuit. Although the above two methods can filter impurities in the pressurized oil, the filling valve is subjected to pressurized oil. This application environment causes the filter to be easily deformed or even broken due to the impact of the oil. Regardless of whether the filter is deformed or broken, it will make it difficult to remove the filter from the filling valve, so that the subsequent maintenance cost of the filling valve is high, and the filling valve may even need to be directly replaced. Summary of the invention

[0004] The present invention provides a new large-flow filterable filling valve, which can absorb impurities in hydraulic oil by centrifugal action by arranging a spiral filter chamber in the valve body, so as to solve the technical problems of high maintenance cost and easy damage of valve core of large-flow filling valve in the prior art.

[0005] The large flow filterable liquid filling valve according to the embodiment of the present invention comprises: a valve body, a valve core and a filter chamber;

[0006] The valve body is provided with an oil inlet and an oil return port; the valve body is provided with a sealing cavity, and the two ends of the sealing cavity are respectively connected to the oil inlet and the oil return port; the valve core is slidably installed in the sealing cavity, and the valve core slides up and down to close or open the sealing cavity;

[0007] The oil inlet is connected to the sealing chamber through the filter chamber; the filter chamber is a circular tube structure, the upper end of which is connected to the oil inlet, and the lower end is connected to the sealing chamber; a spiral guide plate is arranged on the inner wall of the filter chamber; one side of the guide plate is fixed to the inner wall of the filter chamber, and the other side faces the outer wall of the filter chamber and does not contact the outer wall of the filter chamber;

[0008] A filter screen is installed on the inner side of the outer wall of the filter cavity; the filter screen is a porous structure and fits tightly on the outer wall of the filter cavity.

[0009] The large-flow filterable filling valve as described above, wherein a control chamber is also provided in the valve body; a piston which can slide up and down is also provided in the control chamber; a driving rod is fixed to the bottom of the piston and is connected to the valve core through the driving rod; a sliding hole is provided in the valve body, and the driving rod is sleeved in the sliding hole.

[0010] In the large flow filterable filling valve as described above, the control chamber is provided with two control oil ports; the two control oil ports correspond to the upper and lower ends of the piston respectively.

[0011] In the large-flow filterable filling valve as described above, the oil inlet direction of the oil inlet is located in the tangent direction of the outer wall of the filter cavity.

[0012] As described above, the large-flow filterable filling valve, wherein the sealing cavity is a cylindrical structure, the top of which is connected to the filter cavity, and the bottom of which is provided with a guide groove; the sealing cavity is connected to the oil return port through the guide groove.

[0013] The large-flow filterable filling valve as described above, wherein the top of the valve core is an arc-shaped top surface, which corresponds to the bottom of the filter chamber; the top of the valve core is also provided with an adjusting screw rod, which is connected to the driving rod through the adjusting screw rod.

[0014] As described above, in the large-flow filterable filling valve, a sealing ring for embedding and closely contacting with the valve core is arranged in the sealing cavity; the valve core is a cylindrical structure, and the sealing ring is an annular groove.

[0015] In the large-flow filterable filling valve as described above, a return spring is provided between the piston and the control chamber; the return spring and the drive rod are respectively located at two ends of the piston.

[0016] In the large-flow filterable filling valve as described above, a mounting seat is provided in the control chamber; one end of the return spring is fixed on the mounting seat, and the other end is connected to the piston.

[0017] In the large-flow filterable filling valve as described above, a plurality of sealing rings are arranged between the driving rod and the sliding hole.

[0018] In the embodiment of the present invention, a spiral guide channel is provided in the valve body so that when a large flow of hydraulic oil flows through, impurities can be adsorbed on the outer wall of the filter chamber by centrifugal action, thereby playing a filtering role, and there is no need to frequently replace the valve core and the flow rate will not be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a side structural diagram of a large flow filterable filling valve according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 Cross-sectional structure diagram at AA in the middle. DETAILED DESCRIPTION

[0021] The large-flow filterable liquid filling valve described in the present invention can be made of the following materials and components, but is not limited to the following materials and components, such as: valve core, filter screen, guide plate, sealing chamber, sealing ring, etc.

[0022] like Figure 1 The side structure diagram of the large flow filterable filling valve according to the embodiment of the present invention is shown; Figure 2 shown.

[0023] This embodiment includes: a valve body 1 , a valve core 2 and a filter chamber 40 ; the filter chamber 40 is disposed in the valve body 1 .

[0024] The valve body 1 is provided with an oil inlet 11 and an oil return port 12; a sealed cavity 10 is provided inside the valve body 1, and the two ends of the sealed cavity 10 are respectively connected to the oil inlet 11 and the oil return port 12; the valve core 2 is slidably installed in the sealed cavity 10, and the valve core 2 slides up and down to close or open the sealed cavity 10; the valve core 2 plays a role in closing or opening the oil inlet 11 and the oil return port 12.

[0025] Specifically, the sealing cavity 10 is a cylindrical structure, the top of which is connected to the filter cavity 40 , and the bottom of which is provided with a guide groove; the guide groove is an inclined guide groove; the sealing cavity 10 is connected to the oil return port 12 through the guide groove.

[0026] The oil inlet 11 is connected to the sealing chamber 10 through the filter chamber 40; the filter chamber 40 is a circular tube structure, the upper end of which is connected to the oil inlet 11, and the lower end is connected to the sealing chamber 10; a spiral guide plate 4 is arranged on the inner wall of the filter chamber 40; one side of the guide plate 4 is fixed on the inner wall of the filter chamber 40, and the other side faces the outer wall of the filter chamber 40 and does not contact the outer wall of the filter chamber 40; the inner wall and the outer wall of the filter chamber are both cylindrical structures, and the entire filter chamber is a circular guide channel. After the hydraulic oil enters, under the action of the flow velocity, most of it flows along the guide channel separated by the guide plate. Since the flow velocity on the outside is greater, the impurities are transferred to the inner side of the outer wall of the filter chamber 40 by centrifugal force; when the hydraulic oil pressure is high or the flow velocity is large, part of the hydraulic oil can directly flow slowly along the gap between the guide channel and the outer wall, so as not to cause a large pressure drop.

[0027] A filter screen 5 is installed on the inner side of the outer wall of the filter chamber 40 ; the filter screen 5 is a porous structure and fits tightly on the outer wall of the filter chamber 40 .

[0028] During actual use, there is no pressure difference on both sides of the filter, and impurities are adsorbed and blocked only by the gap on one side, so the filter will not be damaged; the filter is set inside the outer wall of the filter chamber 40, and only needs to be taken out and cleaned regularly before it can be used again, which greatly reduces the cost of filtering hydraulic oil.

[0029] The present invention provides a spiral flow guide channel in the valve body so that when a large flow of hydraulic oil flows through, impurities can be adsorbed on the outer wall of the filter cavity by centrifugal action, thereby playing a filtering role, and there is no need to frequently replace the valve core and no flow reduction effect will occur.

[0030] The large-flow filterable filling valve of this embodiment has a control chamber 3 provided in the valve body 1; a piston 30 which can slide up and down is provided in the control chamber 3; a driving rod 23 is fixed to the bottom of the piston 30, and is connected to the valve core 2 through the driving rod 23; a sliding hole is provided in the valve body 1, and the driving rod 23 is sleeved in the sliding hole.

[0031] Specifically, the top of the valve core 1 is an arc-shaped top surface, which corresponds to the bottom of the filter chamber 40; the arc-shaped top surface can reduce pressure drop and turbulence; the top of the valve core 2 is also provided with an adjusting screw 20, which is connected to the driving rod 23 through the adjusting screw 20. The adjusting screw 20 plays a role in adjusting the initial position of the valve core.

[0032] Generally, the control chamber 3 is provided with two control oil ports; the two control oil ports are respectively a first working oil port 31 and a second working oil port 32 ; the two control oil ports correspond to the upper and lower ends of the piston 30 , respectively.

[0033] like Figure 2 As shown, in the large flow filterable filling valve of this embodiment, the oil inlet direction of the oil inlet 11 is located in the tangent direction of the outer wall of the filter chamber 40. In this way, the hydraulic oil can directly impact the filter screen and reduce the pressure drop, thereby maximizing the flow rate of the hydraulic oil in the filter chamber 40.

[0034] In the large flow filterable filling valve of this embodiment, a sealing ring is provided in the sealing cavity 10 for being embedded and in close contact with the valve core 2; the valve core 2 is a cylindrical structure, and the sealing ring is an annular groove. The valve core 2 seals or isolates the entire sealing cavity 10 by contacting with the sealing ring.

[0035] In this embodiment, a return spring 35 is provided between the piston 30 and the control chamber 3 ; the return spring 35 and the driving rod 23 are respectively located at two ends of the piston 30 .

[0036] Generally, a mounting seat is provided in the control chamber 30; one end of the return spring 35 is fixed on the mounting seat, and the other end is connected to the piston 30. The return spring is used to adjust the initial position of the valve core, thereby ensuring that the filling valve is in a normally open or long closed state.

[0037] Typically, in order to isolate the control cavity from the sealing cavity, a plurality of sealing rings are provided between the driving rod 23 and the sliding hole.

[0038] In addition, the large-flow filterable filling valve of the present invention has low manufacturing cost, good maintainability, compact structural design, stable finished product quality, low operating cost, and is suitable for various modified large-flow filling valves.

[0039] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages and disadvantages of the embodiments. Through the description of the above implementation methods, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of some deformations plus the necessary general technology superposition; of course, they can also be implemented by simplifying some important technical features. Based on this understanding, the technical solution of the present invention is essentially or contributes to the prior art in the following aspects: the overall structure and connection method, and the structure described in each embodiment of the present invention.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A large flow filterable filling valve, characterized in that: include: Valve body, valve core and filter chamber; The valve body is provided with an oil inlet and an oil return port; the valve body is provided with a sealing cavity, and the two ends of the sealing cavity are respectively connected to the oil inlet and the oil return port; the valve core is slidably installed in the sealing cavity, and the valve core slides up and down to close or open the sealing cavity; The oil inlet is connected to the sealing chamber through the filter chamber; the filter chamber is a circular tube structure, the upper end of which is connected to the oil inlet, and the lower end is connected to the sealing chamber; a spiral guide plate is arranged on the inner wall of the filter chamber; one side of the guide plate is fixed to the inner wall of the filter chamber, and the other side faces the outer wall of the filter chamber and does not contact the outer wall of the filter chamber; A filter screen is installed on the inner side of the outer wall of the filter cavity; the filter screen is a porous structure and fits tightly on the outer wall of the filter cavity.

2. The large flow filterable filling valve according to claim 1, characterized in that: A control chamber is also provided in the valve body; a piston which can slide up and down is also provided in the control chamber; a driving rod is fixed to the bottom of the piston and is connected to the valve core through the driving rod; a sliding hole is provided in the valve body, and the driving rod is sleeved in the sliding hole.

3. The large flow filterable filling valve according to claim 2, characterized in that: The control chamber is provided with two control oil ports; the two control oil ports correspond to the upper and lower ends of the piston respectively.

4. The large flow filterable filling valve according to claim 3, characterized in that: The oil inlet direction of the oil inlet is located in the tangent direction of the outer wall of the filter cavity.

5. The large flow filterable filling valve according to any one of claims 1 to 4, characterized in that: The sealing cavity is a cylindrical structure, the top of which is connected to the filter cavity, and the bottom of which is provided with a guide groove; the sealing cavity is connected to the oil return port through the guide groove.

6. The large flow filterable filling valve according to any one of claims 2 to 4, characterized in that: The top of the valve core is an arc-shaped top surface, which corresponds to the bottom of the filter chamber; the top of the valve core is also provided with an adjusting screw rod, which is connected to the driving rod through the adjusting screw rod.

7. The large flow filterable filling valve according to any one of claims 1 to 3, characterized in that: A sealing ring is arranged in the sealing cavity for embedding and in close contact with the valve core; the valve core is a cylindrical structure, and the sealing ring is an annular groove.

8. The large flow filterable filling valve according to any one of claims 2-3, characterized in that: A return spring is arranged between the piston and the control chamber; the return spring and the driving rod are respectively located at two ends of the piston.

9. The large flow filterable filling valve according to claim 8, characterized in that: A mounting seat is arranged in the control cavity; one end of the return spring is fixed on the mounting seat, and the other end is connected to the piston.

10. The large flow filterable filling valve according to any one of claims 2-3, characterized in that: A plurality of sealing rings are arranged between the driving rod and the sliding hole.

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