Two-way large-flow energy accumulator prefill valve and tractor with same

Abstract

The utility model relates to a two-way large-flow energy accumulator prefill valve and a tractor. The two-way large-flow energy accumulator prefill valve comprises a two-position three-way main control valve, a first oil filling pipeline, a second oil filling pipeline, a first pilot valve and a second pilot valve, two working oil ports of the two-position three-way main control valve are respectively connected with a main oil way, and one end of the first oil filling pipeline and one end of the second oil filling pipeline are respectively connected with the main oil way. The other end of the first oil filling pipeline is connected with an oil inlet of the first pilot valve and a non-spring side cavity, and the other end of the second oil filling pipeline is connected with an oil inlet of the second pilot valve and a non-spring side cavity. A right working oil port of the first pilot valve and a right working oil port of the second pilot valve are connected with a spring side cavity of the two-position three-way main control valve respectively, the oil inlet pipeline is further connected with a non-spring side cavity of the two-position three-way main control valve, and the two-position three-way main control valve is provided with a bypass port communicated with a right cavity of the two-position three-way main control valve. The energy charging device has the advantages of high energy charging efficiency, independent control of two paths of pressure, high safety coefficient and large bypass flow.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic valves, in particular to a dual-path large-flow accumulator charging valve and a tractor with the same. Background Art

[0002] Currently, conventional tractor accumulators typically use a single-circuit system for filling, resulting in low efficiency and, if a malfunction occurs, malfunction and a low safety factor. A small number of tractors use dual or multi-circuit systems, but these methods make it difficult to independently control the pressure in each circuit, resulting in a low safety factor.

[0003] Based on this, it is necessary to provide a dual-circuit large-flow accumulator charging valve to overcome the above technical problems. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a dual-path large-flow accumulator charging valve and a tractor with the same, which effectively overcomes the defects of the prior art.

[0005] The technical solution of the utility model to solve the above technical problems is as follows:

[0006] A dual-circuit large-flow accumulator charging valve comprises a two-position three-way main control valve, a first oil charging pipeline, a second oil charging pipeline, a first pilot valve and a second pilot valve. The oil inlet of the two-position three-way main control valve is connected to the oil inlet pipeline, and the two working oil ports of the two-position three-way main control valve are respectively connected to the main oil circuit. One end of the first oil charging pipeline and the second oil charging pipeline are respectively connected to the main oil circuit, and the other end of the first oil charging pipeline and the second oil charging pipeline are respectively connected to the accumulator. A one-way valve is respectively provided on the first oil charging pipeline and the second oil charging pipeline. The other end of the first oil charging pipeline is respectively connected to the first pilot valve through a pipeline. The oil inlet and the non-spring side cavity, the other end of the above-mentioned second oil filling pipeline is respectively connected to the oil inlet and the non-spring side cavity of the above-mentioned second pilot valve through pipelines, the right working oil port of the above-mentioned first pilot valve and the right working oil port of the above-mentioned second pilot valve are respectively connected to the spring side cavity of the above-mentioned two-position three-way main control valve through pipelines, the above-mentioned oil inlet pipeline is also connected to the non-spring side cavity of the above-mentioned two-position three-way main control valve through a branch, the above-mentioned two-position three-way main control valve has a bypass port connected to its right cavity, the left working oil port of the above-mentioned first pilot valve and the left working oil port of the above-mentioned second pilot valve are respectively connected to the oil return pipeline through pipelines.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the oil return line and the bypass port are respectively connected to the oil tank.

[0009] Furthermore, the oil inlet pipeline is sequentially connected to the pump and the oil tank.

[0010] Furthermore, a first throttle valve is provided on the first oil filling pipeline.

[0011] Furthermore, a first filter is provided on the first oil filling pipeline, and the first filter is located upstream of the one-way valve.

[0012] Furthermore, a second throttle valve is provided on the second oil filling pipeline.

[0013] Furthermore, a second filter is provided on the second oil filling pipeline, and the second filter is located upstream of the one-way valve.

[0014] Furthermore, the oil inlet pipeline is connected to one end of the first oil filling pipeline and one end of the second oil filling pipeline respectively through a tee.

[0015] Furthermore, the other ends of the first oil filling pipeline and the second oil filling pipeline are respectively provided with pressure detectors.

[0016] The beneficial effects of the utility model are: simple and reasonable structural design, capable of charging the accumulator in two ways, high charging efficiency, and independent control of the two-way pressure, high safety factor, large bypass flow, and can meet the needs of the secondary hydraulic system.

[0017] A tractor is also provided, comprising a dual-path, high-flow accumulator charging valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The usage state of the dual-way large flow accumulator charging valve of the utility model Figure 1 ;

[0019] Figure 2 The usage state of the dual-way large flow accumulator charging valve of the utility model Figure 2 ;

[0020] Figure 3 The usage state of the dual-way large flow accumulator charging valve of the utility model Figure 3 .

[0021] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0022] 1. Two-position three-way main control valve; 2. First oil filling pipeline; 3. Second oil filling pipeline; 4. First pilot valve; 5. Second pilot valve; 6. One-way valve; 21. First throttle valve; 22. First filter; 31. Second throttle valve; 32. Second filter. DETAILED DESCRIPTION

[0023] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0024] Example 1

[0025] like Figure 1 、 2 As shown in Figures 3 and 4, the dual-circuit large-flow accumulator charging valve of this embodiment includes a two-position three-way main control valve 1, a first oil charging pipeline 2, a second oil charging pipeline 3, a first pilot valve 4 and a second pilot valve 5. The oil inlet of the above-mentioned two-position three-way main control valve 1 is connected to the oil inlet pipeline, and the two working oil ports of the above-mentioned two-position three-way main control valve 1 are respectively connected to the main oil circuit, one end of the above-mentioned first oil charging pipeline 2 and the second oil charging pipeline 3 are respectively connected to the above-mentioned main oil circuit, and the other ends of the above-mentioned first oil charging pipeline 2 and the second oil charging pipeline 3 are respectively connected to the accumulator, and a one-way valve 6 is respectively provided on the above-mentioned first oil charging pipeline 2 and the second oil charging pipeline 3. The other end of the above-mentioned first oil charging pipeline 2 is connected to the above-mentioned second oil charging pipeline 3 through pipelines. The oil inlet and non-spring side cavity of a pilot valve 4, the other end of the above-mentioned second oil filling pipeline 3 is connected to the oil inlet and non-spring side cavity of the above-mentioned second pilot valve 5 through pipelines, the right working oil port of the above-mentioned first pilot valve 4 and the right working oil port of the above-mentioned second pilot valve 5 are respectively connected to the spring side cavity of the above-mentioned two-position three-way main control valve 1 through pipelines, the above-mentioned oil inlet pipeline is also connected to the non-spring side cavity of the above-mentioned two-position three-way main control valve 1 through a branch, the above-mentioned two-position three-way main control valve 1 has a bypass port a connected to its right cavity, the left working oil port of the above-mentioned first pilot valve 4 and the left working oil port of the above-mentioned second pilot valve 5 are respectively connected to the return oil pipeline through pipelines.

[0026] In this embodiment, the bypass port a is connected to the secondary hydraulic system.

[0027] In this embodiment, Figure 1 、 2 As shown in Figure 3, the valve core of the two-position three-way main control valve 1 moves left and right inside it, and a spring-side cavity with a spring is formed between the left end of the valve core and the left end of the valve body, and a non-spring-side cavity is formed between the right end of the valve core and the right end of the valve body. When the valve core moves to the right position, the flow channel in the valve core is connected with the bypass port, and the oil inlet is connected with the right-position working oil port. Similarly, the valve core of the first pilot valve 4 moves left and right inside it, and a non-spring-side cavity is formed at the left end of the valve core, and a spring-side cavity with a spring is formed at the right end of the valve core. The valve core of the second pilot valve 5 also moves left and right inside it, and a non-spring-side cavity is formed at the left end of the valve core of the second pilot valve 5, and a spring-side cavity is formed at the right end. In this embodiment, the elastic force of the spring in the first pilot valve 4 is set to be smaller than the elastic force of the spring in the second pilot valve 5. The specific working principle is as follows:

[0028] like Figure 1As shown, in the initial state of filling, when the pressure of the first oil filling pipeline 2 and the second oil filling pipeline 3 is less than or equal to the lower limit pressure set by the filling valve, the first pilot valve 4, the second pilot valve 5 and the two-position three-way main control valve 1 are all in the normal position state of spring return. After the oil enters through the oil inlet pipeline and the P port of the two-position three-way main control valve 1, it is divided into the first oil filling pipeline 2, the second oil filling pipeline 3, the one-way valve 6 and the A1 and A2 ports to flow out of the filling valve to supply oil to the accumulators of the two circuits respectively.

[0029] For example, if the upper filling pressure limit of port A1 is lower than that of port A2, when the outlet pressure of A1 is greater than or equal to the upper filling pressure limit set by the filling valve, the difference between the liquid pressure in the non-spring-side chamber on the left end of the first pilot valve 4 and the spring force on the right end is greater than zero, and the first pilot valve 4 operates in the left position. If the sum of the liquid pressure on the left end of the spool of the two-position three-way main control valve 1 and the spring force minus the liquid pressure on the right end is less than zero, filling of A1 stops.

[0030] When the outlet pressure of A2 is greater than or equal to the upper pressure limit set by the filling valve, the difference between the hydraulic pressure in the non-spring chamber on the left end of the second pilot valve 5 and the spring force on the right end is greater than zero, and the first pilot valve 4 operates in the left position. The sum of the hydraulic pressure and the spring force acting on the spring-side chamber on the left end of the spool of the two-position three-way main control valve 1 minus the hydraulic pressure in the non-spring-side chamber on the right end is less than zero. At the same time, the two-position three-way main control valve 1 is reversed, A2 stops filling, and the excess oil flows into other systems through the bypass port.

[0031] After repeated braking, the fluid in the accumulator decreases, lowering its outlet pressure. The pressure in the non-spring-side chambers on the left side of the first and second pilot valves 4 and 5 also decreases until it reaches the lower pressure limit. At this point, the difference between the fluid pressure in the non-spring-side chambers on the left side of the valve cores of the first and second pilot valves 4 and 5 and the spring force on the right side is less than zero. At this point, the first and second pilot valves 4 and 5 are reset to the right position under the action of the springs. The feedback force on the spring-side chamber on the left side of the two-position, three-way main control valve 1 increases. The sum of the feedback force on the left side (spring-side chamber) and the spring force on the left side minus the pressure on the right side (non-spring-side chamber) is greater than zero, and the two-position, three-way main control valve 1 now operates in its original position. The fluid then enters the charging valve from port P, flowing from ports A1 and A2 of the charging valve to the accumulator, repeating the previous steps.

[0032] On the whole, the structural design is simple and reasonable, and the accumulator can be charged in two ways with high charging efficiency. In addition, the pressure of the two ways is controlled separately, and the safety factor is high.

[0033] It should be noted that the primary advantage of a dual-circuit filling valve over a single-circuit filling valve is that if one part of the brake system fails, the other part continues to operate normally, without interfering with each other. Furthermore, this embodiment highlights the advantages of separate pressure control and a large bypass flow, which can meet the flow requirements of a two-stage hydraulic system.

[0034] In this embodiment, the oil return line and the bypass port are respectively connected to the oil tank.

[0035] In this embodiment, the oil inlet pipeline is connected to the pump and the oil tank in sequence. The oil in the oil tank is normally transported to the pipeline through the pump.

[0036] In this embodiment, a first throttle valve 21 is provided on the first oil filling pipeline 2, which can effectively control the flow rate of the first oil filling pipeline 2 to the A1 port.

[0037] In this embodiment, a first filter 22 is provided on the first oil filling line 2 and is located upstream of the one-way valve 6. The first filter 22 can filter out impurities in the oil, ensuring that the oil entering the accumulator has a low impurity content and does not damage the accumulator and other pipelines and components connected to the accumulator.

[0038] In this embodiment, a second throttle valve 31 is provided on the second oil filling pipeline 3, which can effectively control the flow rate of the second oil filling pipeline 3 to the A2 port.

[0039] In this embodiment, a second filter 32 is provided on the second oil filling line 3, and the second filter 32 is located upstream of the one-way valve 6. The second filter 32 can filter out impurities in the oil, ensuring that the oil entering the accumulator has a low impurity content and does not damage the accumulator and other pipelines and components connected to the accumulator.

[0040] In this embodiment, the oil inlet pipeline is connected to one end of the first oil filling pipeline 2 and the second oil filling pipeline 3 respectively through a tee, ensuring the compact connection and arrangement of the three pipelines.

[0041] In this embodiment, pressure detectors are provided at the other ends of the first oil filling line 2 and the second oil filling line 3. These pressure detectors can detect the pressure information of the two oil filling lines and provide timely feedback to enable adaptive oil filling pressure adjustment to ensure oil filling safety.

[0042] Example 2

[0043] The tractor of this embodiment includes the dual-path large-flow accumulator charging valve of embodiment 1.

[0044] 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", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0046] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0047] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0048] 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 present invention. In this specification, the schematic representations of the above terms do 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. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0049] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A dual-circuit, high-flow accumulator charging valve, characterized by: The invention comprises a two-position three-way main control valve (1), a first oil filling pipeline (2), a second oil filling pipeline (3), a first pilot valve (4) and a second pilot valve (5), wherein the oil inlet of the two-position three-way main control valve (1) is connected to the oil inlet pipeline, the two working oil ports of the two-position three-way main control valve (1) are respectively connected to the main oil circuit, one end of the first oil filling pipeline (2) and the second oil filling pipeline (3) are respectively connected to the main oil circuit, the other end of the first oil filling pipeline (2) and the second oil filling pipeline (3) are respectively connected to the accumulator, the first oil filling pipeline (2) and the second oil filling pipeline (3) are respectively provided with a one-way valve (6), the other end of the first oil filling pipeline (2) is respectively connected to the first pilot valve ( 4), the other end of the second oil filling pipeline (3) is connected to the oil inlet and non-spring side cavity of the second pilot valve (5) through pipelines, the right working oil port of the first pilot valve (4) and the right working oil port of the second pilot valve (5) are connected to the spring side cavity of the two-position three-way main control valve (1) through pipelines, the oil inlet pipeline is also connected to the non-spring side cavity of the two-position three-way main control valve (1) through a branch, the two-position three-way main control valve (1) has a bypass port connected to its right cavity, the left working oil port of the first pilot valve (4) and the left working oil port of the second pilot valve (5) are connected to the return oil pipeline through pipelines.

2. A dual-circuit large-flow accumulator charging valve according to claim 1, characterized in that: The oil return pipeline and the bypass port are connected to the oil tank respectively.

3. The dual-circuit high-flow accumulator charging valve according to claim 1, characterized in that: The oil inlet pipeline is connected to the pump and the oil tank in sequence.

4. The dual-circuit, high-flow accumulator charging valve according to claim 1, characterized in that: A first throttle valve (21) is provided on the first oil filling pipeline (2).

5. The dual-circuit high-flow accumulator charging valve according to claim 4, characterized in that: A first filter (22) is provided on the first oil filling pipeline (2), and the first filter (22) is located upstream of the one-way valve (6).

6. The dual-path high-flow accumulator charging valve according to claim 1, characterized in that: A second throttle valve (31) is provided on the second oil filling pipeline (3).

7. The dual-circuit, high-flow accumulator charging valve according to claim 6, characterized in that: A second filter (32) is provided on the second oil filling pipeline (3), and the second filter (32) is located upstream of the one-way valve (6).

8. The dual-path high-flow accumulator charging valve according to claim 1, characterized in that: The oil inlet pipeline is connected to one end of the first oil filling pipeline (2) and one end of the second oil filling pipeline (3) respectively through a tee.

9. A dual-circuit, high-flow accumulator charging valve according to any one of claims 1 to 8, characterized in that: The other ends of the first oil-filling pipeline (2) and the second oil-filling pipeline (3) are respectively provided with pressure detectors.

10. A tractor, characterized in that: It comprises a dual-way high-flow accumulator charging valve as described in any one of claims 1 to 9.

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