Valve structure and hydraulic system

Abstract

The utility model relates to the technical field of hydraulic systems, in particular to a valve structure and a hydraulic system. A valve structure is arranged aiming at a motor and comprises a main valve, a pressure oil tank and a return oil tank, and the number of the reversing valve banks is two, the two reversing valve banks are arranged aiming at two oil ports of the motor respectively, each reversing valve bank comprises two reversing valves which are arranged in parallel, an oil outlet of one reversing valve is communicated with an energy recovery oil way, an oil outlet of the other reversing valve is communicated with an oil return box, and the reversing valves control the through-flow area of the oil way where the reversing valves are located. The utility model also provides a hydraulic system, which comprises a pump for pumping out pressure oil; a valve structure; the pressure oil drives the motor to work under the control of the main valve; and during braking, return oil of the motor is subjected to energy recovery through the reversing valve group. The technical problem that a recycled energy recycling system in the prior art cannot adjust the proportion of oil return flow for energy recycling is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a hydraulic technology field, concretely relates to a valve structure and hydraulic system. BACKGROUND

[0002] For the walking machine with rotation function, the rotation action is usually driven by hydraulic pressure, and the oil is supplied by the main pump, the multi-way valve is controlled, and the rotation motor is driven. When the rotation brake is performed, the control handle returns to the middle position, at this time, the rotation valve core of the multi-way valve returns to the middle position, the oil inlet of the rotation motor is cut off, and the passage between the main pump and the oil tank and the oil return port of the rotation motor and the oil tank is cut off, the oil return flow of the rotation motor is overflowed through the brake valve high pressure, and the rotation motor brake is realized. This part of the oil return flow is all converted into heat, on the one hand, this part of energy is wasted, on the other hand, the oil temperature is raised, and more energy is consumed by the cooling system, and the energy efficiency of the whole machine is reduced, and the oil consumption is increased.

[0003] In order to avoid energy waste, the excavator in the prior art is provided with an energy recovery system for the rotation function, so as to recycle the energy. As disclosed in the document with the application number CN202120207866.5, a kinetic energy recovery energy recycling system and an excavator, a kinetic energy recovery energy recycling system, including a working branch, an energy storage branch, an energy recycling branch and a pressure relief branch. The working branch includes a first pump and a rotation motor. The first pump is in fluid communication with the rotation motor to provide oil to the rotation motor. The first pump drives the rotation motor to rotate. Specifically, the oil output by the first pump enters the rotation motor through the reversing valve. The reversing valve is a three-position four-way valve, which changes the direction of the oil entering the rotation motor, and changes the rotation direction of the rotation motor, so as to realize the forward rotation and reverse rotation of the rotation motor. The energy storage branch includes an energy accumulator, and the energy accumulator is in hydraulic communication with the rotation motor to receive the oil released by the rotation motor. The oil output by the rotation motor is stored by the energy accumulator to realize secondary utilization. The energy recycling branch includes an auxiliary motor. The auxiliary motor is in fluid communication with the energy accumulator; the auxiliary motor is drivingly connected with the first pump. The energy accumulator drives the auxiliary motor to work, and the auxiliary motor drives the first pump to work. In this way, the oil consumption for driving the first pump to work can be reduced. According to the existing excavator model, more than 5% energy saving is realized. The pressure relief branch is in fluid communication with the energy accumulator. The pressure relief branch is configured to be conducted in the stop state to automatically release the oil in the energy accumulator, and the pressure relief branch is controlled in the start state.

[0004] The kinetic energy recovery energy recycling system can realize the recovery of the energy of the rotation motor to the energy accumulator, and the first sequence valve and the second sequence valve can only control the on-off of the corresponding oil path, and cannot adjust the proportion of the oil return flow of the rotation motor for energy recovery. UTILITY MODEL CONTENTS

[0005] In order to solve the technical problem that the energy recycling system in the prior art cannot adjust the proportion of the oil return flow for energy recovery, the utility model provides a valve structure and a hydraulic system, and solves the above technical problem.

[0006] In order to solve the above technical problem, the utility model provides a valve structure, is arranged for a motor and comprises:

[0007] A main valve controls the on-off between the two oil ports of the motor and the pressure oil and the oil return tank.

[0008] Two groups of reversing valve groups are arranged for the two oil ports of the motor, each group of reversing valve groups comprises two reversing valves arranged in parallel, the oil outlet of one reversing valve is connected with the energy recovery oil circuit, the oil outlet of the other reversing valve is connected with the oil return tank, and the reversing valve controls the flow area of the oil circuit.

[0009] According to one embodiment of the utility model, the reversing valve is a two-position two-way reversing valve.

[0010] According to one embodiment of the utility model, a one-way valve is arranged between the oil port of the motor and the corresponding reversing valve group, and the oil in the oil port of the motor flows to the corresponding reversing valve group in one direction.

[0011] According to one embodiment of the utility model, the utility model further comprises two overflow valves, and the two overflow valves are connected with the two oil ports of the motor respectively.

[0012] According to one embodiment of the utility model, the main valve is reversed under the action of the pilot pressure, when the main valve is in the middle position, the pressure oil is discharged to the oil return tank.

[0013] According to one embodiment of the utility model, the main valve is a three-position six-way valve, the main valve is formed with a pressure oil port p1, a pressure oil port p2, a return oil port t1, a return oil port t2 and two working oil ports, the pressure oil port p1 and the pressure oil port p2 introduce the pressure oil, the return oil port t1 and the return oil port t2 are connected with the oil return tank, and the two working oil ports are connected with the two oil ports of the motor respectively, when the main valve core is in the middle position, the pressure oil port p1 and the return oil port t1 are connected; when the main valve core is in the two working positions, the pressure oil port p1 is disconnected with the return oil port t1, the pressure oil port p2 is connected with one working oil port, and the other working oil port is connected with the return oil port t2.

[0014] According to one embodiment of the utility model, the utility model further comprises a valve body, and the main valve and the reversing valve group are installed in the valve body.

[0015] The utility model further provides a hydraulic system, which comprises:

[0016] A pump discharges the pressure oil.

[0017] Valve structure

[0018] Motor, pressure oil drives the motor to work under the control of the main valve; when braking, the motor back oil is energy recovered through the reversing valve group.

[0019] According to one embodiment of the utility model, the motor is a rotary motor, and the energy recovery oil circuit is communicated with the main oil circuit to supply oil to other actuators.

[0020] Based on the above technical scheme, the utility model can realize the following technical effects:

[0021] 1. The valve structure of the utility model, by setting the reversing valve group for the two oil ports of the motor, the reversing valve group includes two reversing valves arranged in parallel, the oil outlet of one reversing valve is communicated with the energy recovery oil circuit, and the oil outlet of the other reversing valve is communicated with the back oil tank; the flow area of the oil circuit is controlled by the two reversing valves respectively, and then the proportion of the motor back oil flow used for energy recovery is adjusted;

[0022] 2. The valve structure of the utility model, by setting the one-way valve between the oil port of the motor and the reversing valve group, the oil flow can only flow from the motor to the reversing valve group, and cannot flow reversely; two overflow valves are arranged, so that the oil pressure of the two oil ports of the motor cannot be too high;

[0023] 3. The valve structure of the utility model, by setting the structure of the main valve, when the main valve is in the middle position, the pressure oil is directly discharged to the back oil tank; when the main valve is in the two working positions, the oil inlet and outlet of the two oil ports of the motor can be controlled, so that the whole vehicle can make rotary motion in two directions;

[0024] 4. The valve structure of the utility model, the main valve and the reversing valve group are installed in the valve body, so that the integration degree is high, and the occupied volume is small;

[0025] 5. The hydraulic system of the utility model can realize the control of the work of the rotary motor, and when the rotary motor brakes, the motor back oil can flow to the main oil circuit through the reversing valve group to supply oil to other actuators; the setting of the reversing valve group can control the proportion of the motor back oil flow used for energy recovery. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the structural schematic view of the hydraulic system of the utility model;

[0027] In the figure: 1-main valve; 21-first reversing valve group; 211-first reversing valve; 212-second reversing valve; 22-second reversing valve group; 221-third reversing valve; 222-fourth reversing valve; 31-first check valve; 32-second check valve; 41-first overflow valve; 42-second overflow valve; 51-oil supply oil way; 52-first working oil way; 53-second working oil way; 54-first oil way; 55-second oil way; 56-energy recovery oil way; 10-motor; 20-pump; 30-oil return tank. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0029] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation, device, component and / or combination thereof.

[0030] Unless specifically stated otherwise, the relative arrangements of the components and steps illustrated in these embodiments and the numerical expressions and values set forth herein are not limiting of the scope of the present application. It should be understood that the various parts of the drawings are not necessarily drawn to scale, and that, for the purpose of convenience and clarity, not all components can be shown in a given figure. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail, but are to be considered as part of the description of the present application. In all examples shown and discussed herein, any specific values are to be interpreted as examples only and are not to be construed as limiting. Other examples of the exemplary embodiments can have different values. It is noted that like numbers and letters on the figures identify like parts throughout the disclosure, and that, when a part is not further discussed, it is not necessary to further discuss it in the subsequent figures.

[0031] In the description of the utility model, it needs to be understood that the orientation words such as '' front, back, up, down, left, right '' '' horizontal, vertical, perpendicular, horizontal '' and '' top, bottom '' and the like indicated orientation or positional relationship usually based on the orientation or positional relationship shown in the drawing, just for the convenience of describing the utility model and simplifying the description, under the circumstances without making the opposite statement, these orientation words do not indicate and imply the device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it can not be understood as the limitation of the protection scope of the utility model;The orientation words '' inside, outside '' refer to the inside and outside relative to the contour of each component.

[0032] For the convenience of description, spatial relative terms such as '' above'', '' above'', '' upper surface'', '' upper '' and the like can be used here to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawing. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawing. For example, if the device in the drawing is inverted, the device described as '' above '' or '' above '' other devices or structures will be positioned '' below '' or '' below '' other devices or structures. Thus, the exemplary term '' above '' can include both '' above '' and '' below '' orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative description used here is interpreted accordingly.

[0033] In addition, it needs to be explained that the use of '' first'', '' second '' and the like to limit parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it can not be understood as the limitation of the protection scope of the utility model.

[0034] As Figure 1 As shown in the figure, the embodiment provides a valve structure, which is arranged for the motor 10 and comprises a main valve 1 and a reversing valve group, the main valve 1 controls the on-off between the two oil ports of the motor 10 and the pressure oil and the oil return tank 30, and the reversing valve group is two groups, which is arranged for the two oil ports of the motor 10 and is used for adjusting the oil return flow of the motor 10 to adjust the proportion of energy recovery.

[0035] The main valve 1 is used for controlling the inlet and outlet oil of the motor 10, and the main valve 1 is reversed under the action of pilot pressure, when the main valve 1 is in the middle position, the pressure oil is discharged to the oil return tank 30, when the main valve 1 is in the two working positions, the main valve 1 controls the pressure oil to enter one oil port of the motor 10, and the other oil port of the motor 10 returns oil through the main valve 1.

[0036] As a preferred technical solution of the embodiment, the main valve 1 is a three-position six-way valve, and a valve core of the main valve 1 is formed with a pressure oil port p1, a pressure oil port p2, a return oil port t1, a return oil port t2 and two working oil ports, the two working oil ports are a working oil port a and a working oil port b respectively, the pressure oil port p1 and the pressure oil port p2 introduce pressure oil, the return oil port t1 and the return oil port t2 communicate with the return oil tank 30, and the working oil port a and the working oil port b respectively communicate with two oil ports of the motor 10. Further, the two oil ports of the motor 10 are an oil port AS and an oil port BS respectively, the working oil port a communicates with the oil port AS through a first working oil circuit 52, and the working oil port b communicates with the oil port BS through a second working oil circuit 53. When the valve core of the main valve 1 is in the neutral position, the pressure oil port p1 communicates with the return oil port t1, and the pressure oil is discharged to the return oil tank 30; when the valve core of the main valve 1 is in the first working position, the pressure oil port p1 is disconnected from the return oil port t1, the pressure oil port p2 communicates with the working oil port a, and the working oil port b communicates with the return oil port t2, at this time, the oil port AS of the motor 10 takes in oil, and the oil port BS discharges oil; when the valve core of the main valve 1 is in the second working position, the pressure oil port p1 is disconnected from the return oil port t1, the pressure oil port p2 communicates with the working oil port b, and the working oil port a communicates with the return oil port t2, at this time, the oil port BS of the motor 10 takes in oil, and the oil port AS discharges oil.

[0037] As a preferred technical solution of the embodiment, the valve core of the main valve 1 is reversed under the action of the pilot pressure, one end of the valve core of the main valve 1 can be applied with the pilot pressure XAS, and the other end can be applied with the pilot pressure XBS, when the valve core of the main valve 1 is applied with the pilot pressure XAS, the valve core of the main valve 1 is in the first working position; when the valve core of the main valve 1 is applied with the pilot pressure XBS, the valve core of the main valve 1 is in the second working position.

[0038] The reversing valve group is two groups, which are a first reversing valve group 21 and a second reversing valve group 22, the first reversing valve group 21 communicates with the oil port AS of the motor 10, and the second reversing valve group 22 communicates with the oil port BS of the motor 10. The first reversing valve group 21 and the second reversing valve group 22 respectively include two reversing valves arranged in parallel, an oil outlet of one reversing valve communicates with the energy recovery oil circuit 56, and an oil outlet of the other reversing valve communicates with the return oil tank 30, the reversing valve can control the flow area of the oil circuit where the reversing valve is located, thereby controlling the proportion of the motor 10 return oil flow used for energy recovery.

[0039] As a preferred technical solution of this embodiment, the first reversing valve group 21 includes a first reversing valve 211 and a second reversing valve 212 arranged in parallel. The first reversing valve group 21 is arranged on the first oil passage 54. One end of the first oil passage 54 is connected to the oil port AS of the motor 10, and the other end of the first oil passage 54 forms two parallel branch oil passages. The first reversing valve 211 and the second reversing valve 212 are respectively located on the two branch oil passages of the first oil passage 54. The branch oil passage where the first reversing valve 211 is located is connected to the energy recovery oil passage 56, and the branch oil passage where the second reversing valve 212 is located is connected to the return oil tank 30. The second directional valve group 22 includes a third directional valve 221 and a fourth directional valve 222 arranged in parallel. The second directional valve group 22 is arranged on the second oil passage 55. One end of the second oil passage 55 is connected to the oil port BS of the motor 10, and the other end of the second oil passage 55 forms two parallel branch oil passages. The third directional valve 221 and the fourth directional valve 222 are respectively located on the two branch oil passages of the second oil passage 55. The branch oil passage where the third directional valve 221 is located is connected to the energy recovery oil passage 56, and the branch oil passage where the fourth directional valve 222 is located is connected to the return oil tank 30.

[0040] As a preferred embodiment, the first directional valve 211, the second directional valve 212, the third directional valve 221, and the fourth directional valve 222 can all be configured as two-position two-way valves, and the four directional valves can be configured as spool valves to facilitate control of the flow area of ​​their respective oil circuits. The oil inlets of the first directional valve 211 and the second directional valve 212 are both connected to the oil port AS of the motor 10, the oil outlet of the first directional valve 211 is connected to the energy recovery oil circuit 56, and the oil outlet of the second directional valve 212 is connected to the return oil tank 30; the oil inlets of the third directional valve 221 and the fourth directional valve 222 are both connected to the oil port BS of the motor 10, the oil outlet of the third directional valve 221 is connected to the energy recovery oil circuit 56, and the oil outlet of the fourth directional valve 222 is connected to the return oil tank 30.

[0041] As a preferred embodiment, the directional valves in the directional valve assembly switch under the action of pilot pressure. Specifically, the first directional valve 211 switches under the action of pilot pressure XAP, the second directional valve 212 switches under the action of pilot pressure XAT, the third directional valve 221 switches under the action of pilot pressure XBP, and the fourth directional valve 222 switches under the action of pilot pressure XBT. Initially, the directional valves can be in the open state. Under the action of the corresponding pilot pressure, the valve core of the directional valve slides towards the connected position to switch, thereby controlling the flow area.

[0042] To limit the flow direction of the return oil from the motor 10, a check valve is provided between the oil port of the motor 10 and the corresponding directional valve group to control the oil from the oil port of the motor 10 to flow unidirectionally to the corresponding directional valve group. Specifically, a first check valve 31 is provided on the first oil circuit 54, which controls the return oil from the oil port AS to flow unidirectionally to the first directional valve group 21, and prevents it from flowing in the opposite direction; a second check valve 32 is provided on the second oil circuit 55, which controls the return oil from the oil port BS to flow unidirectionally to the second directional valve group 22, and prevents it from flowing in the opposite direction.

[0043] To control the pressure at the oil port of motor 10, an overflow valve is also provided at the oil port of motor 10 to limit the maximum pressure at the oil port of motor 10. Specifically, oil port AS of motor 10 is connected to a first overflow valve 41, and oil port BS of motor 10 is connected to a second overflow valve 42. If the oil pressure at oil port AS of motor 10 is too high and exceeds the set value of the first overflow valve 41, oil can be discharged to the return oil tank 30 through the first overflow valve 41; if the oil pressure at oil port BS of motor 10 is too high and exceeds the set value of the second overflow valve 42, oil can be discharged to the return oil tank 30 through the second overflow valve 42.

[0044] For ease of installation and use, the valve structure in this embodiment can be equipped with a valve body. The main valve 1, two sets of directional valve groups, and two check valves can all be installed in the valve body. The oil supply circuit 51, the first working circuit 52, the second working circuit 53, the first circuit 54, the second circuit 55, and the energy recovery circuit 56 can all be installed in the valve body. The oil supply circuit 51 can extend to the outer surface of the valve body to form an oil port, which facilitates the introduction of pressurized oil. The first working circuit 52 and the second working circuit 53 can extend to the outer surface of the valve body to form an oil port, which facilitates the connection of the oil port AS and oil port BS of the motor 10. The energy recovery circuit 56 can extend to an oil port, which facilitates the connection of the main circuit or other circuits to realize energy recovery.

[0045] This embodiment also provides a hydraulic system, including a pump 20, a motor 10 and the aforementioned valve structure. The pump 20 is used to pump out pressurized oil. The pump outlet of the pump 20 is connected to the pressure oil port p1 and pressure oil port p2 of the main valve 1. The oil port AS of the motor 10 is connected to the working oil port a of the main valve 1. The oil port BS of the motor 10 is connected to the working oil port b of the main valve 1. The first directional valve group 21 is connected to the oil port AS, and the second directional valve group 22 is connected to the oil port BS.

[0046] As a preferred technical solution in this embodiment, the motor 10 is a rotary motor, the energy recovery oil circuit 56 can be connected to the main oil circuit, and the return oil of the motor 10 when braking can enter the main oil circuit through the reversing valve group to supply oil to other actuators such as the boom, stick, and bucket that need to move.

[0047] Based on the above technical solution, the hydraulic system of this embodiment can be used in mobile machinery such as excavators. During the swing braking process of such mobile machinery, the return oil flow of the swing motor can be introduced into the main oil circuit and distributed to the working links that need to operate. The setting of the reversing valve group can control the proportion of motor return oil used for energy recovery.

[0048] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A valve structure, provided for a motor (10), characterized in that, Comprising: A main valve (1) controlling the on-off of two oil ports of a motor (10) and a pressure oil, a return oil tank (30); A reversing valve group, two groups of reversing valve groups are provided for two oil ports of the motor (10), the reversing valve group comprises two reversing valves arranged in parallel, the oil outlet of one reversing valve is connected with an energy recovery oil circuit (56), and the oil outlet of the other reversing valve is connected with the return oil tank (30), and the reversing valve controls the flow area of the oil circuit.

2. A valve structure according to claim 1, wherein The reversing valve is a two-position two-way reversing valve.

3. A valve structure according to claim 1, wherein A one-way valve is arranged between the oil port of the motor (10) and the corresponding reversing valve group, and the oil of the oil port of the motor (10) flows to the corresponding reversing valve group in one direction.

4. The valve structure of claim 1, wherein Two overflow valves are further included, and the two overflow valves are connected with two oil ports of the motor (10) respectively.

5. The valve structure of claim 1, wherein The main valve (1) is reversed under the action of a pilot pressure, and when the main valve (1) is in the middle position, the pressure oil is discharged to the return oil tank (30).

6. A valve structure according to claim 5, wherein The main valve (1) is a three-position six-way valve, and the main valve (1) is formed with a pressure oil port p1, a pressure oil port p2, a return oil port t1, a return oil port t2 and two working oil ports, the pressure oil ports p1 and p2 introduce pressure oil, the return oil ports t1 and t2 are connected with the return oil tank (30), and the two working oil ports are connected with two oil ports of the motor (10) respectively, when the spool of the main valve (1) is in the middle position, the pressure oil port p1 and the return oil port t1 are connected; when the spool of the main valve (1) is in two working positions, the pressure oil port p1 is disconnected with the return oil port t1, the pressure oil port p2 is connected with one working oil port, and the other working oil port is connected with the return oil port t2.

7. The valve structure of claim 1, wherein A valve body is further included, and the main valve (1) and the reversing valve group are mounted in the valve body.

8. A hydraulic system characterized by, Comprising: A pump (20) pumping pressure oil; The valve structure of any one of claims 1-7; A motor (10) driven by the pressure oil under the control of the main valve (1) to work; when braking, the motor (10) returns oil and recovers energy through the reversing valve group.

9. A hydraulic system according to claim 8, wherein, The motor (10) is a rotary motor, and the energy recovery oil circuit (56) is connected with a main oil circuit to supply oil to other actuators.

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