Unloading valve group and hydraulic control system

Abstract

The utility model relates to hydraulic technology field provides an unloading valve group and hydraulic control system. In unloading valve group, unloading valve is equipped with first control oil hole and second control oil hole. The same side of first control oil hole is provided with first control spring. Second control oil hole is connected with high pressure oil inlet of unloading valve group, and unloading valve can switch between unloading position and unloading cut -off position. Control valve is connected between high pressure oil inlet and first control oil hole, and control valve can switch between complete intercommunication state and half intercommunication state or cut -off state. Switch valve is connected between first control oil hole and oil return of unloading valve group, and switch valve can switch between intercommunication position and cut -off position. In the pressure boost action of unloading valve group, high pressure oil liquid can reach first control oil hole through control valve rapidly, so that unloading valve switches to unloading cut -off position and carries out pressure boost rapidly, thereby, can greatly improve the pressure boost response speed of unloading valve group, and then improves the stability of system pressure.

Description

Technical Field

[0001] This utility model relates to the field of hydraulics, and in particular to an unloading valve assembly and a hydraulic control system. Background Technology

[0002] The unloading valve assembly is an important pressure control component in a hydraulic control system, and its performance directly affects the stability of the pump station pressure. The damping orifice is a key structure for the unloading valve assembly to complete the unloading action. However, due to the presence of this damping orifice, during the pressurization action, the high-pressure oil needs to pass through the damping orifice to reach the control chamber of the unloading valve. As a result, the pressurization response of the unloading valve assembly is slow, affecting the stability of the system pressure. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides an unloading valve assembly and a hydraulic control system.

[0004] A first aspect of this utility model provides an unloading valve assembly, comprising: an unloading valve having a first control port and a second control port, a first control spring being disposed on the same side of the first control port, and the second control port being connected to the high-pressure inlet of the unloading valve assembly, the unloading valve being switchable between an unloading position and an unloading stop position; a control valve being connected between the high-pressure inlet and the first control port, the control valve being switchable between a fully connected state, a partially connected state, or a stop state; and a switching valve being connected between the first control port and the return port of the unloading valve assembly, the switching valve being switchable between a connected position and a stop position.

[0005] According to the present invention, in the unloading position, the high-pressure oil inlet is connected to the oil return port; in the unloading cut-off position, the high-pressure oil inlet is cut off from the oil return port.

[0006] According to the present invention, in the connected position, the first control port is connected to the return port; in the cut-off position, the first control port is cut off from the return port.

[0007] According to the present invention, an unloading valve assembly is provided, wherein the control valve includes a two-position two-way directional valve, the two-position two-way directional valve including a first working position and a second working position. In the first working position, the high-pressure oil inlet is cut off from the first control oil port, and the control valve is in the cut-off state. In the second working position, the high-pressure oil inlet is connected to the first control oil port through the two-position two-way directional valve, and the control valve is in the fully connected state.

[0008] According to the present invention, an unloading valve assembly is provided, wherein the control valve includes: a damping orifice connected between the high-pressure oil inlet and the first control oil port; and a two-position two-way reversing valve, which is arranged in parallel with the damping orifice. The two-position two-way reversing valve includes a first working position and a second working position. In the first working position, the high-pressure oil inlet is connected to the first control oil port through the damping orifice, and the control valve is in the semi-connected state. In the second working position, the high-pressure oil inlet is connected to the first control oil port through the two-position two-way reversing valve, and the control valve is in the fully connected state.

[0009] According to the present invention, an unloading valve assembly further includes a one-way valve, wherein the oil inlet of the one-way valve is connected to the high-pressure oil inlet, and the oil outlet of the one-way valve is connected to the high-pressure oil outlet of the unloading valve assembly.

[0010] According to the present invention, an unloading valve assembly further includes: a switching backup valve, wherein the switching backup valve is arranged in parallel with the switching valve, the switching backup valve is provided with a single-sided control port, a second control spring is provided on the opposite side of the single-sided control port, the single-sided control port is connected to the outlet of the one-way valve, and the switching backup valve is capable of switching between a connected backup position and a cut-off backup position; in the connected backup position, the first control port is connected to the return port, and in the cut-off backup position, the first control port is cut off from the return port.

[0011] According to the unloading valve assembly provided by this utility model, when the pressure at the high-pressure oil outlet is higher than the safety pressure value, the control valve switches to the cut-off state or the semi-connected state, the switching valve switches to the connected position, or the switching backup valve switches to the connected backup position; when the pressure at the high-pressure oil outlet is not higher than the safety pressure value, the control valve switches to the fully connected state, the switching valve switches to the cut-off position, or the switching backup valve switches to the cut-off backup position.

[0012] According to the present invention, an unloading valve assembly further includes a filter disposed between the high-pressure oil inlet and the control valve.

[0013] According to a second aspect of the present invention, a hydraulic control system is provided, comprising: an unloading valve assembly as described above.

[0014] The unloading valve assembly provided by this utility model includes an unloading valve, a control valve, and a switching valve. The unloading valve has a first control port and a second control port. A first control spring is provided on the same side of the first control port. The second control port is connected to the high-pressure inlet of the unloading valve assembly, and the unloading valve can switch between an unloading position and an unloading stop position. The control valve is connected between the high-pressure inlet and the first control port, and the control valve can switch between a fully connected state, a partially connected state, or a stop state. Specifically, a fully connected state refers to the control valve's port opening reaching its maximum; a stop state refers to the control valve's port opening being 0; and a partially connected state refers to the control valve's port opening being between 0 and its maximum value. The switching valve is connected between the first control port and the return port of the unloading valve assembly, and the switching valve can switch between a connected position and a stop position.

[0015] During operation, when unloading is required, the switching valve switches to the connected position, and the control valve switches to the semi-connected or closed position. Oil from the first control port is discharged to the return port via the switching valve. The high-pressure inlet port connects to the second control port. The pressure on one side of the second control port is greater than the spring force of the first control spring, causing the unloading valve to switch to the unloading position, and the unloading valve assembly is in the unloading state. When pressurization is required, the switching valve switches to the closed position, and the control valve switches to the fully connected position. The high-pressure inlet port connects to the second control port, and the high-pressure inlet port quickly connects to the first control port via the control valve. The sum of the pressure at the first control port and the spring force of the first control spring is greater than the pressure at the second control port, causing the unloading valve to switch to the unloading closed position, meaning the unloading valve assembly can rapidly increase pressure.

[0016] With this structural design, during the pressurization action of the unloading valve group, the high-pressure oil at the high-pressure inlet can quickly reach the first control port through the control valve, so that the unloading valve can quickly switch to the unloading cut-off position for pressurization. This greatly improves the pressurization response speed of the unloading valve group, thereby improving the stability of the system pressure.

[0017] Furthermore, the hydraulic control system provided by this utility model, since it includes the unloading valve assembly as described above, also possesses the advantages described above. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 The structural principle of the unloading valve assembly provided by this utility model Figure 1 .

[0020] Figure 2 The structural principle of the unloading valve assembly provided by this utility model Figure 2 .

[0021] Reference numerals: 100, unloading valve; 110, first control port; 120, second control port; 130, first control spring; 210, damping orifice; 220, two-position two-way directional valve; 300, switching valve; 410, high-pressure inlet; 420, return port; 430, high-pressure outlet; 500, check valve; 600, switching standby valve; 610, second control spring; 700, filter. Detailed Implementation

[0022] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0023] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0025] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples, to make the objectives, technical solutions, and advantages of the present invention clearer. The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The following is combined Figure 1 and Figure 2 This invention describes an unloading valve assembly and hydraulic control system provided in an embodiment of the present invention. It should be understood that the following description is merely an illustrative embodiment of the present invention and does not constitute any particular limitation on the present invention.

[0028] An embodiment of the first aspect of this utility model provides an unloading valve assembly, such as... Figure 1 and Figure 2As shown, the unloading valve assembly includes: an unloading valve 100, which has a first control port 110 and a second control port 120. A first control spring 130 is provided on the same side of the first control port 110. The second control port 120 is connected to the high-pressure inlet port 410 of the unloading valve assembly. The unloading valve 100 can switch between an unloading position and an unloading cut-off position. A control valve is connected between the high-pressure inlet port 410 and the first control port 110. The control valve can switch between a fully connected state, a partially connected state, or a cut-off state. Specifically, a fully connected state refers to the control valve's port opening reaching its maximum, a cut-off state refers to the control valve's port opening being 0, and a partially connected state refers to the control valve's port opening being between 0 and its maximum value. A switching valve 300 is connected between the first control port 110 and the return port 420 of the unloading valve assembly. The switching valve 300 can switch between a connected position and a cut-off position.

[0029] During operation, when unloading is required, the switching valve 300 switches to the connected position, and the control valve switches to the semi-connected or closed position. Oil from the first control port 110 is discharged to the return port 420 via the switching valve 300. The high-pressure inlet port 410 connects to the second control port 120. The pressure on one side of the second control port 120 is greater than the elastic force of the first control spring 130, causing the unloading valve 100 to switch to the unloading position, and the unloading valve assembly is in the unloading state. When pressurization is required, the switching valve 300 switches to the closed position, and the control valve switches to the fully connected position. The high-pressure inlet port 410 connects to the second control port 120. The high-pressure inlet port 410 quickly connects to the first control port 110 via the control valve. The sum of the pressure at the first control port 110 and the elastic force of the first control spring 130 is greater than the pressure at the second control port 120, causing the unloading valve 100 to switch to the unloading closed position, meaning the unloading valve assembly can rapidly increase pressure.

[0030] With this structural design, during the pressurization action of the unloading valve group, the high-pressure oil at the high-pressure inlet 410 can quickly reach the first control port 110 through the control valve, so that the unloading valve 100 can quickly switch to the unloading cut-off position for pressurization. This can greatly improve the pressurization response speed of the unloading valve group, thereby improving the stability of the system pressure.

[0031] In one embodiment of this utility model, in the unloaded position, the high-pressure oil inlet 410 is connected to the oil return port 420; in the unloaded cut-off position, the high-pressure oil inlet 410 is cut off from the oil return port 420.

[0032] In one embodiment of the present invention, in the connected state, the first control oil port 110 is connected to the return oil port 420; in the cut-off state, the first control oil port 110 is cut off from the return oil port 420.

[0033] Furthermore, in one embodiment of this utility model, such as Figure 1 As shown, the unloading valve assembly also includes: a one-way valve 500, the oil inlet of the one-way valve 500 is connected to the high-pressure oil inlet 410, and the oil outlet of the one-way valve 500 is connected to the high-pressure oil outlet 430 of the unloading valve assembly.

[0034] In actual work process, such as Figure 1 and Figure 2 As shown, when the unloading valve assembly needs to be unloaded, the switching valve 300 switches to the connected position, the control valve switches to the semi-connected or shut-off state, the first control port 110 is depressurized to the return port 420, the valve core of the unloading valve 100 moves to the right to switch to the unloading position, and the oil output from the high-pressure inlet port 410 flows back to the return port 420 through the unloading valve 100. When the unloading valve assembly needs to be pressurized, the switching valve 300 switches to the shut-off position, the control valve switches to the fully connected state, and the high-pressure oil at the high-pressure inlet port 410 can be quickly diverted to the first control port 110 and the second control port 120. Under the action of the first control spring 130, the valve core moves to the left to switch to the unloading shut-off position. At this time, the high-pressure oil at the high-pressure inlet port 410 is supplied to the high-pressure outlet port 430 through the check valve 500, and the high-pressure outlet port 430 is connected to the load.

[0035] In one embodiment of this utility model, such as Figure 2 As shown, the control valve includes a two-position two-way directional valve 220. The two-position two-way directional valve 220 includes a first working position and a second working position. In the first working position, the high-pressure oil inlet 410 is cut off from the first control oil port 110, and the control valve is in the cut-off state. In the second working position, the high-pressure oil inlet 410 is connected to the first control oil port 110 through the two-position two-way directional valve 220, and the control valve is in the fully connected state.

[0036] In other words, in this embodiment, a two-position two-way directional valve 220 is used to replace the damping orifice 210 in the existing unloading valve assembly. In actual operation, when the unloading valve assembly needs to be unloaded, the switching valve 300 switches to the connected position, and the two-position two-way directional valve 220 switches to the first working position. At this time, the control valve is in the closed state, the first control port 110 is depressurized to the return port 420, the valve core of the unloading valve 100 moves to the right to switch to the unloading position, and the oil output from the high-pressure inlet port 410 flows back to the return port 420 through the unloading valve 100.

[0037] When the unloading valve assembly needs pressurization, the switching valve 300 switches to the off position, the two-position two-way directional valve 220 switches to the second working position, and the control valve is in a fully connected state. The high-pressure oil at the high-pressure inlet 410 can be quickly diverted to the first control port 110 and the second control port 120. Under the action of the first control spring 130, the valve core moves to the left to switch to the unloading off position. At this time, the high-pressure oil at the high-pressure inlet 410 is supplied to the high-pressure outlet 430 through the check valve 500.

[0038] In another embodiment of this utility model, such as Figure 1 As shown, the control valve includes: a damping orifice 210, which is connected between the high-pressure oil inlet 410 and the first control oil port 110; and a two-position two-way directional valve 220, which is connected in parallel with the damping orifice 210. The two-position two-way directional valve 220 includes a first working position and a second working position. In the first working position, the high-pressure oil inlet 410 is connected to the first control oil port 110 through the damping orifice 210, and the control valve is in a semi-connected state. In the second working position, the high-pressure oil inlet 410 is connected to the first control oil port 110 through the two-position two-way directional valve 220, and the control valve is in a fully connected state.

[0039] In other words, in this embodiment, the existing unloading valve assembly can be directly modified by connecting a two-position two-way directional valve 220 in parallel at the original damping orifice 210 position. In actual operation, when the unloading valve assembly needs to be unloaded, the switching valve 300 switches to the connected position, and the two-position two-way directional valve 220 switches to the first working position. At this time, due to the presence of the damping orifice 210, the control valve is in a semi-connected state, the first control port 110 is depressurized to the return port 420, the valve core of the unloading valve 100 moves to the right to switch to the unloading position, and the oil output from the high-pressure inlet port 410 flows back to the return port 420 through the unloading valve 100.

[0040] When the unloading valve assembly needs pressurization, the switching valve 300 switches to the off position, the two-position two-way directional valve 220 switches to the second working position, and the control valve is in a fully connected state. The high-pressure oil at the high-pressure inlet 410 can be quickly diverted to the first control port 110 and the second control port 120. Under the action of the first control spring 130, the valve core moves to the left to switch to the unloading off position. At this time, the high-pressure oil at the high-pressure inlet 410 is supplied to the high-pressure outlet 430 through the check valve 500.

[0041] In one embodiment of this utility model, the unloading valve assembly further includes a switching backup valve 600, which is connected in parallel with the switching valve 300. The switching backup valve 600 has a single-sided control port, and a second control spring 610 is provided on the opposite side of the single-sided control port. The single-sided control port is connected to the outlet of the one-way valve 500. The switching backup valve 600 can switch between a connected backup position and a cut-off backup position. In the connected backup position, the first control port 110 is connected to the return port 420. In the cut-off backup position, the first control port 110 is cut off from the return port 420. With this structure, when the switching valve 300 malfunctions, the working state of the unloading valve assembly can be adjusted by the switching backup valve 600.

[0042] In one embodiment of this utility model, when the pressure at the high-pressure oil outlet 430 is higher than the safe pressure value, the control valve switches to the cut-off state or the semi-connected state, the switching valve 300 switches to the connected position, or the switching standby valve 600 switches to the connected standby position.

[0043] When the pressure at the high-pressure outlet 430 is not higher than the safe pressure value, the control valve switches to the fully connected state, the switching valve 300 switches to the cut-off position, or the standby switching valve 600 switches to the cut-off standby position.

[0044] In this embodiment, a corresponding controller can be provided, with a preset safety pressure value. Both the two-position two-way directional valve 220 and the switching valve 300 can be configured as solenoid valves. The controller can adjust the working state of the two-position two-way directional valve 220 and the switching valve 300 based on the relationship between the actual pressure value of the high-pressure outlet 430 and the safety pressure value, thereby unloading or pressurizing the unloading valve assembly.

[0045] In one embodiment of the present invention, the unloading valve assembly further includes a filter 700, which is disposed between the high-pressure oil inlet 410 and the control valve.

[0046] In a second aspect of this utility model, a hydraulic control system is provided, comprising: an unloading valve assembly as described above.

[0047] Furthermore, the hydraulic control system provided by this utility model, since it includes the unloading valve assembly as described above, also possesses the advantages described above.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An unloading valve group, characterized by, include: The unloading valve (100) is provided with a first control port (110) and a second control port (120). A first control spring (130) is provided on the same side of the first control port (110). The second control port (120) is connected to the high pressure inlet (410) of the unloading valve group. The unloading valve (100) can switch between the unloading position and the unloading stop position. A control valve is connected between the high-pressure oil inlet (410) and the first control oil port (110), and the control valve can switch between a fully connected state, a partially connected state, or a cut-off state. A switching valve (300) is connected between the first control port (110) and the return port (420) of the unloading valve group. The switching valve (300) can switch between the connected position and the cut-off position.

2. The unloader valve group of claim 1, wherein In the unloading position, the high-pressure oil inlet (410) is connected to the oil return port (420); in the unloading cut-off position, the high-pressure oil inlet (410) is cut off from the oil return port (420).

3. The unloader valve group of claim 2, wherein, In the connected state, the first control port (110) is connected to the return port (420); in the cut-off state, the first control port (110) is cut off from the return port (420).

4. The unloader valve group of claim 3, wherein, The control valve includes: A two-position two-way directional control valve (220) includes a first working position and a second working position. In the first working position, the high-pressure oil inlet (410) is cut off from the first control oil port (110), and the control valve is in the cut-off state. In the second working position, the high-pressure oil inlet (410) is connected to the first control oil port (110) through the two-position two-way directional control valve (220), and the control valve is in the fully connected state.

5. The unloader valve group of claim 3, wherein The control valve includes: A damping orifice (210) is connected between the high-pressure oil inlet (410) and the first control oil inlet (110); A two-position two-way directional valve (220) is provided in parallel with the damping orifice (210). The two-position two-way directional valve (220) includes a first working position and a second working position. In the first working position, the high-pressure oil inlet (410) is connected to the first control oil port (110) through the damping orifice (210), and the control valve is in the half-connected state. In the second working position, the high-pressure oil inlet (410) is connected to the first control oil port (110) through the two-position two-way directional valve (220), and the control valve is in the fully connected state.

6. The unloader valve group according to any one of claims 1 to 5, characterized in that, The unloading valve assembly also includes: A one-way valve (500) is provided, with its inlet connected to the high-pressure inlet (410) and its outlet connected to the high-pressure outlet (430) of the unloading valve assembly.

7. The unloader valve group of claim 6, wherein, The unloading valve assembly also includes: A switching backup valve (600) is provided, which is connected in parallel with the switching valve (300). The switching backup valve (600) is provided with a single-sided control port, and a second control spring (610) is provided on the opposite side of the single-sided control port. The single-sided control port is connected to the outlet of the one-way valve (500). The switching backup valve (600) can switch between the connected backup position and the cut-off backup position. In the state of being in the connected standby position, the first control oil port (110) is connected to the oil return port (420), and in the state of being in the disconnected standby position, the first control oil port (110) is disconnected from the oil return port (420).

8. The unloader valve group of claim 7, wherein, When the pressure at the high-pressure oil outlet (430) is higher than the safe pressure value, the control valve switches to the cut-off state or the semi-connected state, the switching valve (300) switches to the connected position, or the switching standby valve (600) switches to the connected standby position. When the pressure at the high-pressure outlet (430) is not higher than the safety pressure value, the control valve switches to the fully connected state, the switching valve (300) switches to the cut-off position, or the switching backup valve (600) switches to the cut-off backup position.

9. The unloading valve assembly according to claim 1, characterized in that, The unloading valve assembly also includes: A filter (700) is disposed between the high-pressure oil inlet (410) and the control valve.

10. A hydraulic control system, characterized in that, include: The unloading valve assembly as described in any one of claims 1 to 9.

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