CN107725518A - A kind of Stress control valve group and hydraulic control valve group - Google Patents

Abstract

The invention discloses a pressure control valve group and a hydraulic control valve group. The pressure control valve group includes a relief valve and a pressure control unit. The pressure control unit includes: an electromagnetic reversing valve and a check valve. The control oil X port of the variable pump module is respectively connected to the oil inlet and the corresponding electromagnetic reversing valve The oil inlet of the corresponding one-way valve is connected, and the oil outlet of each check valve is connected with the oil inlet of the overflow valve, and the oil outlet of the overflow valve and the oil outlet of each electromagnetic reversing valve are connected with each other. The oil return T port is connected. When the pressure control valve group needs to start the non-working variable variable pump module to work, the electromagnet of the electromagnetic reversing valve corresponding to the variable variable pump module to be started is energized, so that the control oil of the variable variable pump module passes through the electromagnetic reversing valve. If it flows to the oil return port, the pressure of the oil outlet of the variable pump module will be kept at a very low value, which can make the variable pump module start at a lower pressure, thereby reducing the impact of the starting current of the drive motor of the variable pump module on Grid shock.

Description

A pressure control valve group and a hydraulic control valve group

technical field

The invention relates to the field of hydraulic control, in particular to a pressure control valve group and a hydraulic control valve group.

Background technique

The pressure control valve is used in the hydraulic system and is mainly used for the pressure control of multiple parallel variable variable pump modules to ensure the pressure stability of the output of multiple variable variable pump modules. Each variable variable pump module includes a variable variable hydraulic pump.

The existing pressure control valve is a proportional relief valve. When in use, multiple parallel variable pump modules are connected in parallel to output pressure oil to a common pressure pipeline to provide power for the actuator. At the same time, the common pressure pipeline is connected with the The oil inlet port of the proportional relief valve is connected, and the output pressure of all variable displacement pump modules is remotely controlled through the proportional relief valve.

In the process of realizing the present invention, the inventor finds that there are at least the following problems in the prior art:

During the operation of the hydraulic system, when it is found that the output pressure and flow of the variable hydraulic pump cannot meet the action of the actuator, it is necessary to start other non-working variable hydraulic pumps to work. At this time, the non-working variable hydraulic pump is under load when starting. In the starting condition, the outlet pressure of the variable hydraulic pump is high under this working condition, which increases the starting current of the driving motor of the variable hydraulic pump, which will have a large impact on the power grid and easily cause the variable hydraulic pump to fail to start.

Contents of the invention

In order to solve the problem that the hydraulic system in the prior art will have a large impact on the power grid, the embodiment of the present invention provides a pressure control valve group and a hydraulic control valve group. Described technical scheme is as follows:

The present invention provides a pressure control valve group, which includes a relief valve and a pressure control unit corresponding to a variable pump module one by one. The pressure control unit includes: an electromagnetic reversing valve and a check valve. The variable pump module The control oil port X is respectively communicated with the oil inlet of the corresponding electromagnetic reversing valve and the inlet oil of the corresponding one-way valve, and the oil outlet of each one-way valve is connected with the oil outlet of the relief valve. The oil inlet is connected, and the oil outlet of the overflow valve and each of the electromagnetic reversing valves are connected with the oil return T port.

Specifically, the pressure control valve group further includes: a cut-off valve and an electric proportional relief valve, the oil inlet of the cut-off valve communicates with the oil inlet of the relief valve, and the oil outlet of the cut-off valve communicates with the oil inlet of the relief valve. The oil inlet port of the electric proportional relief valve is connected, and the oil outlet port of the electric proportional relief valve is connected with the oil return T port.

Further, the rated pressure of the proportional relief valve is 31.5MPa.

Further, the pressure control valve group further includes: a filter, the oil inlet of the filter communicates with the oil inlet of the relief valve, and the oil outlet of the filter communicates with the inlet of the cut-off valve. The oil port is connected.

Furthermore, the pressure control valve group further includes: a pressure switch, the oil inlet of the pressure switch communicates with the oil inlet of the filter, and the oil outlet of the pressure switch communicates with the oil outlet of the filter. The oil port is connected.

Specifically, a pressure measuring port is provided on the oil path between the control oil X port of the variable displacement pump module and the oil inlet port of the electromagnetic reversing valve.

Specifically, the rated pressure of the relief valve is 31.5MPa.

On the other hand, an embodiment of the present invention provides a hydraulic control valve group, the hydraulic control valve group includes a plurality of variable pump modules and the pressure control valve group, the pressure control valve group includes a relief valve and the A plurality of the pressure control units corresponding to the plurality of variable variable pump modules one by one, each of the pressure control units includes: an electromagnetic reversing valve and a check valve, and the control oil port X of each variable variable pump module is respectively connected to the The oil inlet of the corresponding electromagnetic reversing valve communicates with the oil inlet of the corresponding one-way valve, and the oil outlet of each one-way valve communicates with the oil inlet of the overflow valve, so The oil outlet of the overflow valve and the oil outlet of each electromagnetic reversing valve are connected with the oil return T port.

Specifically, the sum of the control oil flows of the plurality of variable variable pump modules is less than the rated flow of the relief valve, and the control oil flow of each variable variable pump module is 1.5-2 L/min.

Further, the pressure control valve group further includes: a cut-off valve and an electric proportional relief valve, the oil inlet of the cut-off valve communicates with the oil inlet of the relief valve, and the oil outlet of the cut-off valve communicates with the oil inlet of the relief valve. The oil inlet port of the electric proportional relief valve is connected, and the oil outlet port of the electric proportional relief valve is connected with the oil return T port; the sum of the control oil flow of the multiple variable pump modules is less than the electric The rated flow rate of the proportional relief valve.

The beneficial effect brought by the technical solution provided by the embodiment of the present invention is: the embodiment of the present invention provides a pressure control valve group, and the pressure control valve group makes the variable variable pump module to be activated work The electromagnet of the electromagnetic reversing valve corresponding to the pump module is energized, so that the control oil of the variable displacement pump module flows to the oil return port after passing through the electromagnetic reversing valve. The oil port pressure will be kept at a very low value, allowing the variable pump module to start at a lower pressure, thereby reducing the impact of the starting current of the drive motor of the variable pump module on the grid.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic hydraulic diagram of a pressure control valve group provided in Embodiment 1 of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Embodiment one

The embodiment of the present invention provides a pressure control valve group. As shown in FIG. 1, the pressure control valve group b includes a relief valve 1 and a pressure control unit 2 corresponding to the variable pump module a one by one. The pressure control unit 2 includes : Electromagnetic reversing valve 3 and check valve 4, the control oil port X of the variable pump module a is respectively connected with the oil inlet port of the corresponding electromagnetic reversing valve 3 and the inlet oil of the corresponding check valve 4, each check valve The oil outlets of 4 are all communicated with the oil inlet of overflow valve 1, and the oil outlets of overflow valve 1 and the oil outlets of each electromagnetic reversing valve 3 are all communicated with the oil return T port. Wherein, the electromagnetic reversing valve 3 is a two-way electromagnetic reversing valve.

Specifically, the pressure control valve group b may also include: a stop valve 5 and an electric proportional relief valve 6, the oil inlet of the stop valve 5 communicates with the oil inlet of the relief valve 1, and the oil outlet of the stop valve 5 communicates with the oil inlet of the relief valve 1. The oil inlet port of the electric proportional relief valve 6 is connected, and the oil outlet port of the electric proportional relief valve 6 is connected with the oil return T port. When the overflow valve 1 can work normally, the cut-off valve 5 is closed. When the overflow valve 1 fails, in order to ensure that the pressure control valve group b can work normally, the cut-off valve 5 is opened, and the electric proportional overflow valve 6 Work instead of the relief valve 1, so as to ensure that the pressure control valve group b can work normally, so that the pressure of multiple variable pump modules a can be effectively controlled. In addition, the electric proportional relief valve 6 can be a remote adjustable electric proportional relief valve. By operating the electric proportional relief valve 6 and the relief valve 1 at the same time, when the electric proportional relief valve 6 fails, the shut-off valve 5 closed, only works through relief valve 1.

Specifically, the rated pressure of the proportional relief valve 6 may be 31.5MPa. This rated pressure can meet the requirements of most hydraulic systems.

Further, the pressure control valve group b may also include: a filter 7, the oil inlet of the filter 7 communicates with the oil inlet of the overflow valve 1, and the oil outlet of the filter 7 communicates with the oil inlet of the stop valve 1 connected. The filter 7 can filter the hydraulic oil in the oil circuit, so as to prevent impurities in the hydraulic oil from entering the actuator through the pressure control valve group b, thereby ensuring the normal operation of the actuator. In this embodiment, the filtration accuracy of the filter 7 can be 10 μm, which is used to filter out impurities in the oil, so that the cleanliness of the oil entering the electric proportional relief valve 6 can meet the requirements of the electric proportional relief valve 6, Generally, the cleanliness of the electric proportional relief valve 6 is NAS up to 7 grades.

Further, the pressure control valve group b may also include: a pressure switch 8, the oil inlet of the pressure switch 8 communicates with the oil inlet of the filter 7, and the oil outlet of the pressure switch 8 communicates with the oil outlet of the filter 7 . In this embodiment, the pressure switch 8 is used for the clogging alarm of the filter 7 .

Specifically, a pressure measuring port 9 is provided on the oil path between the control oil port X of the variable displacement pump module a and the oil inlet port of the electromagnetic reversing valve 3 . The pressure measuring port 9 is used to monitor the pressure of the oil circuit where it is located.

Specifically, the rated pressure of the relief valve 1 may be 31.5MPa. This rated pressure can meet the requirements of most hydraulic systems.

The following briefly introduces the working principle of the pressure control valve group provided by the embodiment of the present invention, specifically as follows:

When it is necessary to start the variable variable pump module a that is not working, the electromagnet V1 of the electromagnetic reversing valve 3 corresponding to the variable variable pump module a to be started is energized, so that the control oil of the variable variable pump module a passes through the electromagnetic reversing valve 3 Afterwards, it flows to the oil return T port. Usually, the oil return T port is directly connected to the oil tank c, and the pressure of the oil outlet of the variable pump module a will be kept at a very low value (about 1-3.5MPa, which is the same as that of the variable pump module a is related to the pressure loss of the internal control oil circuit, the pressure loss of the internal control oil circuit of the variable pump module a produced by different manufacturers is different), which can make the variable pump module a start at a lower pressure, thereby reducing the start of the variable pump The starting current of the motor of module a and the impact on the grid. The pressure of the control oil of the variable displacement pump module a can be changed through the relief valve 1, thereby the outlet pressure of multiple variable displacement pump modules a. When the variable pump module a is started, the electromagnet V1 of the electromagnetic reversing valve 3 can be de-energized, and the oil at the oil outlet of the variable pump module a flows into the execution structure through the check valve 4 . During this process, when the pressure of the oil flowing out of the one-way valve 4 exceeds the rated pressure of the relief valve 1, the relief valve 1 can discharge the oil flowing out of the one-way valve 4 to the oil return port T.

If it is necessary to start a plurality of non-working variable displacement pump modules a to work at the same time, the pressure control unit 2 can act at the same time.

The embodiment of the present invention provides a pressure control valve group. When the pressure control valve group needs to start the unoperated variable variable pump module to work, the electromagnet of the electromagnetic reversing valve corresponding to the variable variable pump module to be started is energized, so that The control oil of the variable pump module flows to the oil return port after passing through the electromagnetic reversing valve. Usually, the oil return port is directly connected with the oil tank, so the pressure of the oil outlet port of the variable variable pump module will be kept at a very low value, allowing the variable pump The module starts at a lower pressure, thereby reducing the impact of the starting current of the drive motor of the variable displacement pump module on the grid.

Embodiment two

The embodiment of the present invention provides a hydraulic control valve group, see Figure 1, the hydraulic control valve group includes a pressure control valve group b and a plurality of variable pump modules a, the pressure control valve group b includes a relief valve 1 and a plurality of The variable pump module a corresponds to a plurality of pressure control units 2 one by one. Each pressure control unit 2 includes: an electromagnetic reversing valve 3 and a check valve 4. The control oil port X of each variable pump module a is connected to the corresponding electromagnetic reversing valve respectively. The oil inlet of the valve 3 is connected with the oil inlet of the corresponding one-way valve 4, the oil outlet of each check valve 4 is connected with the oil inlet of the relief valve 1, and the oil outlet of the relief valve 1 is connected with the oil inlet of the relief valve 1. The oil outlet of each electromagnetic reversing valve 3 is in communication with the oil return T port.

Further, the sum of the control oil flow of multiple variable variable pump modules a is less than the rated flow of the relief valve 1, and the control oil flow of each variable variable pump module a is 1.5-2 L/min.

Further, the pressure control valve group b may also include: a cut-off valve 5 and an electric proportional relief valve 6, the oil inlet of the cut-off valve 5 communicates with the oil inlet of the relief valve 6, and the oil outlet of the cut-off valve 5 communicates with the oil inlet of the relief valve 6. The oil inlet port of the electric proportional relief valve 6 is connected, and the oil outlet port of the electric proportional relief valve 6 is connected with the oil return port T; flow.

Specifically, each variable pump module a includes: a variable pump a1, a variable cylinder a2, a pressure compensator a3, and a relief valve a4 of the variable pump module. The oil outlet of the variable pump a1 is connected to the rod cavity, The first control oil X1 port of the pressure compensator a3, the A port of the pressure compensator a3, the second control oil X2 port of the pressure compensator a3, and the oil inlet of the electromagnetic reversing valve 3 corresponding to each variable pump module a The port is connected with the inlet oil of the corresponding one-way valve 4, the B port of the pressure compensator a3 is respectively connected with the rodless chamber of the variable cylinder a2 and the oil tank c, and the oil outlet of the variable pump a1 is also connected with the relief valve a4 of the variable pump module The oil inlet of the variable pump module is connected to the oil outlet of the relief valve a4, the variable reversing control port of the variable pump a1, and the C port of the pressure compensator a3 are all connected to the oil tank c, and the piston rod of the variable variable cylinder a2 is connected to the variable Variable structure connection for pump a1. Among them, the variable cylinder a2 is used to adjust the displacement of the variable pump a1. The relief valve a4 of the variable displacement pump module is used to control the maximum output pressure of the variable displacement pump a1. The pressure compensator a3 is used to control the displacement of the variable displacement pump a1, so that the displacement of the variable displacement pump a1 can just meet the required actual flow.

Specifically, the variable displacement pump a1 needs to supply oil to the actuator of the hydraulic control valve group, and the actuator may be a hydraulic motor d. Each variable pump module a includes: variable pump check valve a5, the oil inlet port of the variable pump check valve a5 communicates with the oil outlet port of the variable pump a1, and the oil outlet port of the variable pump check valve a5 communicates with the hydraulic motor d The oil inlet is connected. The variable pump check valve a5 is used to prevent the oil flowing out of the variable pump a1 from flowing back into the variable pump a1.

The working principle of the hydraulic control valve group provided in the embodiment of the present invention may refer to the working principle of the pressure control valve group.

The embodiment of the present invention provides a hydraulic control valve group. When the hydraulic control valve group needs to start the unoperated variable variable pump module to work, the electromagnet of the electromagnetic reversing valve corresponding to the variable variable pump module to be started is energized, so that The control oil of the variable pump module flows to the oil return port after passing through the electromagnetic reversing valve. Usually, the oil return port is directly connected with the oil tank, so the pressure of the oil outlet port of the variable variable pump module will be kept at a very low value, allowing the variable pump The module starts at a lower pressure, thereby reducing the impact of the starting current of the drive motor of the variable displacement pump module on the grid.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (10)

1. a kind of Stress control valve group, including overflow valve, it is characterised in that the Stress control valve group also includes：With variable pump The one-to-one pressure control unit of module, the pressure control unit include：Solenoid directional control valve and check valve, the variable pump The oily X mouths of control of module connect with the oil inlet of the corresponding solenoid directional control valve and the imported oil of the corresponding check valve respectively Logical, the oil inlet of the oil-out of each check valve with the overflow valve connect, the oil-out of the overflow valve and each The oil-out of the solenoid directional control valve connects with oil return T mouths.

2. Stress control valve group according to claim 1, it is characterised in that the Stress control valve group also includes：Cut-off Valve and electric proportional pressure control valve, the oil inlet of the stop valve connect with the oil inlet of the overflow valve, the stop valve it is fuel-displaced Mouth connects with the oil inlet of the electric proportional pressure control valve, and the oil-out of the electric proportional pressure control valve connects with the oil return T mouths.

3. Stress control valve group according to claim 2, it is characterised in that the rated pressure of the proportional pressure control valve is 31.5MPa。

4. Stress control valve group according to claim 2, it is characterised in that the Stress control valve group also includes：Filtering Device, the oil inlet of the filter connect with the oil inlet of the overflow valve, the oil-out of the filter and the stop valve Oil inlet connection.

5. Stress control valve group according to claim 4, it is characterised in that the Stress control valve group also includes：Pressure Switch, the oil inlet of the pressure switch connects with the oil inlet of the filter, the oil-out of the pressure switch with it is described The oil-out connection of filter.

6. Stress control valve group according to claim 1, it is characterised in that the control oil X mouths of the variable pump module with Pressure tap is provided with oil circuit between the oil inlet of the solenoid directional control valve.

7. Stress control valve group according to claim 1, it is characterised in that the rated pressure of the overflow valve is 31.5MPa。

8. a kind of hydraulic control valve group, it is characterised in that the hydraulic control valve group includes multiple variable pump modules and such as right It is required that any one of 1~7 Stress control valve group, the Stress control valve group include overflow valve and with the multiple variable pump mould The one-to-one multiple pressure control units of block, each pressure control unit include：Solenoid directional control valve and unidirectional Valve, each variable pump module control oily X the mouths oil inlet with the corresponding solenoid directional control valve and corresponding institute respectively The imported oil connection of check valve is stated, each oil inlet of the oil-out of the check valve with the overflow valve connects, described to overflow The oil-out of the oil-out and each solenoid directional control valve that flow valve connects with oil return T mouths.

9. hydraulic control valve group according to claim 8, it is characterised in that the control oil stream of the multiple variable pump module The metered flow that sum is less than the overflow valve is measured, and the oil stream amount that controls of each variable pump module is 1.5~2L/min.

10. hydraulic control valve group according to claim 9, it is characterised in that the Stress control valve group also includes：Cut-off Valve and electric proportional pressure control valve, the oil inlet of the stop valve connect with the oil inlet of the overflow valve, the stop valve it is fuel-displaced Mouth connects with the oil inlet of the electric proportional pressure control valve, and the oil-out of the electric proportional pressure control valve connects with the oil return T mouths；Institute The control oil stream amount sum for stating multiple variable pump modules is less than the metered flow of the electric proportional pressure control valve.