Multi-stage overflow loop of multi-pump multi-pressure-stage hydraulic system

Abstract

The utility model relates to the technical field of overflow loops, and particularly discloses a multi-stage overflow loop of a multi-pump multi-pressure-stage hydraulic system, which comprises a liquid supply module and an overflow module, and the liquid supply module comprises a first pump set, a second pump set and a third pump set. The overflow module comprises a first main overflow valve, a second main overflow valve, a third main overflow valve and a secondary overflow valve, and a plurality of hydraulic pump sets such as the first pump set, the second pump set and the third pump set are used for supplying liquid to the execution unit; the secondary overflow valve is respectively connected with the first main overflow valve, the second main overflow valve and the third main overflow valve to carry out first-level pressure overflow, the secondary overflow valve is simultaneously connected with oil outlet pipelines of a plurality of pump sets, the secondary overflow valve can carry out second-level pressure overflow on the plurality of pump sets, and due to the fact that only one secondary overflow valve is adopted, the cost is low, the structure is simple, and the cost is low. And debugging is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of overflow circuits, in particular to a multi-stage overflow circuit of a multi-pump multi-pressure stage hydraulic system. Background Art

[0002] Hydraulic systems are widely used in industrial fields such as machinery manufacturing, mining, and construction. With the development of technology, the performance requirements for hydraulic systems are becoming increasingly higher. Especially in complex operating environments, hydraulic systems need to be able to provide different pressure levels to adapt to different work requirements. Therefore, multi-pump and multi-pressure level hydraulic systems have come into being. Such systems can flexibly adjust the output pressure under different working conditions, thereby improving work efficiency and equipment adaptability.

[0003] In the prior art, as shown in the accompanying drawings Figure 1 The multi-pump multi-pressure-level hydraulic system includes a first main overflow valve 4, a second main overflow valve 5, a third main overflow valve 6, a secondary overflow valve 7 and three hydraulic pump groups, wherein a secondary overflow valve needs to be arranged in front of the check valve of the oil outlet of each pump group, and the multi-pressure level switching is performed by whether the electromagnet is energized or not. However, a secondary overflow valve needs to be arranged for each hydraulic pump group, which is costly, and the wiring and debugging workload of the main overflow valve is very large, and the integration of the multi-pressure level switching function is poor. Summary of the Invention

[0004] The present invention is made in consideration of the above-mentioned problems. The purpose of the utility model is to provide a multi-stage overflow circuit of a multi-pump and multi-pressure-level hydraulic system. Multiple pump groups only need one secondary overflow valve, which can save costs, and the wiring between the main overflow valve and the secondary overflow valve is clearer, which is also convenient for switching between multiple pressure levels.

[0005] To achieve the above objectives, the present invention provides a multi-stage overflow circuit of a multi-pump, multi-pressure-level hydraulic system, comprising a liquid supply module and an overflow module. The liquid supply module comprises a fuel tank and a first pump group and a second pump group for supplying liquid to an actuator unit. The oil inlets of the first pump group and the second pump group are both connected to the fuel tank, and the oil outlet of the first pump group is connected to the oil inlet of the actuator unit through a first pipeline, and the oil outlet of the second pump group is connected to the oil inlet of the actuator unit through a second pipeline.

[0006] The overflow module includes a first main overflow valve, a second main overflow valve and a secondary overflow valve. The oil outlets of the first main overflow valve, the second main overflow valve and the secondary overflow valve are all connected to the oil tank, and the oil inlet of the first main overflow valve is connected to the first pipeline, the oil inlet of the second main overflow valve is connected to the second pipeline, the oil inlet of the secondary overflow valve is connected to the first pipeline and the second pipeline at the same time, and the opening pressure of the secondary overflow valve is less than the opening pressure of the first main overflow valve and the second main overflow valve.

[0007] According to the multi-stage overflow circuit of the multi-pump multi-pressure level hydraulic system described above, the liquid supply module also includes a first one-way valve and a second one-way valve, the first one-way valve is located on the first pipeline, the second one-way valve is located on the second pipeline, and the openings of the first one-way valve and the second one-way valve are both facing the execution unit.

[0008] According to the multi-stage overflow circuit of the multi-pump multi-pressure-stage hydraulic system described above, the first pipeline includes a first branch pipeline located between the oil outlet of the first pump group and the oil inlet of the first one-way valve, and a second branch pipeline located between the oil outlet of the first one-way valve and the actuator unit; the second pipeline includes a third branch pipeline located between the oil outlet of the second pump group and the oil inlet of the second one-way valve, and a fourth branch pipeline located between the oil outlet of the second one-way valve and the actuator unit;

[0009] The first main overflow valve is in communication with the first branch pipe, the second main overflow valve is in communication with the third branch pipe, and the secondary overflow valve is in communication with both the second branch pipe and the fourth branch pipe.

[0010] According to the multi-stage overflow circuit of the multi-pump multi-pressure level hydraulic system described above, the overflow module also includes a cartridge valve, the oil inlet of the secondary overflow valve is connected to the first pipeline and the second pipeline through a third pipeline, and the cartridge valve is located on the third pipeline and can control the opening or closing of the third pipeline.

[0011] According to the multi-stage overflow circuit of a multi-pump multi-pressure level hydraulic system described above, the overflow module also includes an electromagnetic reversing valve, the oil inlet of the electromagnetic reversing valve is connected to the oil outlet of the cartridge valve, the oil outlet of the electromagnetic reversing valve is connected to the oil inlet of the secondary overflow valve, and an electromagnet is provided on the electromagnetic reversing valve. When the electromagnet is energized, the oil inlet of the electromagnetic reversing valve is connected to the oil outlet of the electromagnetic reversing valve.

[0012] The multi-stage overflow circuit of the multi-pump multi-pressure stage hydraulic system according to the above further comprises a third pump group for supplying liquid to the execution unit, and the overflow module further comprises a third main overflow valve, the oil inlet of the third pump group is communicated with the oil tank, the oil outlet of the third pump group is communicated with the execution unit through a fourth pipeline, the oil inlets of the third main overflow valve and the secondary overflow valve are communicated with the fourth pipeline, and the oil outlet of the third main overflow valve is communicated with the oil tank.

[0013] The multi-stage overflow circuit of the multi-pump multi-pressure stage hydraulic system according to the above further comprises a third one-way valve, the third one-way valve is located on the fourth pipeline, and the opening of the third one-way valve faces the execution unit.

[0014] The multi-stage overflow circuit of the multi-pump multi-pressure stage hydraulic system according to the above, the fourth pipeline comprises a fifth sub-pipeline between the oil inlet of the third one-way valve and the oil outlet of the third pump group and a sixth sub-pipeline between the oil outlet of the third one-way valve and the execution unit, the oil inlet of the third main overflow valve is communicated with the fifth sub-pipeline, and the oil inlet of the secondary overflow valve is communicated with the sixth sub-pipeline.

[0015] The multi-stage overflow circuit of the multi-pump multi-pressure stage hydraulic system according to the above, the first pump group, the second pump group and the third pump group each comprise a hydraulic pump and a motor, the motor is electrically connected with the hydraulic pump, and the oil inlets of the hydraulic pumps are each communicated with the oil tank through a fifth pipeline.

[0016] The multi-stage overflow circuit of the multi-pump multi-pressure stage hydraulic system according to the above, the liquid supply module further comprises a filter, and the filter is installed on one end of the fifth pipeline in the oil tank.

[0017] The multi-stage overflow circuit of the multi-pump multi-pressure stage hydraulic system according to the above, the first pump group, the second pump group and the third pump group each comprise a hydraulic pump and a motor, the motor is electrically connected with the hydraulic pump, and the oil inlets of the hydraulic pumps are each communicated with the oil tank through a fifth pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of an overall oil circuit of the prior art;

[0019] Figure 2 is a schematic diagram of an overall oil circuit of the embodiment.

[0020] In the drawings:

[0021] 1. First pump group; 2. Second pump group; 3. Third pump group; 4. First main relief valve; 5. Second main relief valve; 6. Third main relief valve; 7. Secondary relief valve; 8. First check valve; 9. Second check valve; 10. Third check valve; 11. Cartridge valve; 12. Solenoid reversing valve; 13. Filter. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0023] like Figure 2 As shown, a multi-stage overflow circuit of a multi-pump multi-pressure level hydraulic system includes a liquid supply module and an overflow module. The liquid supply module is used to supply liquid to the execution unit, and the overflow module is used to overflow the hydraulic oil at multiple pressure levels to ensure that the oil pressure entering the execution unit is not higher than the preset pressure.

[0024] The execution unit may be a driving component such as various oil cylinders.

[0025] Specifically, the liquid supply module includes a fuel tank and a first pump group 1 and a second pump group 2 for supplying liquid to the execution unit. The oil inlets of the first pump group 1 and the second pump group 2 are both connected to the fuel tank, wherein the oil outlet of the first pump group 1 is connected to the oil inlet of the execution unit through a first pipe, and the oil outlet of the second pump group 2 is connected to the oil inlet of the execution unit through a second pipe, that is, the first pump group 1 and the second pump group 2 can independently supply oil to the execution unit, and its overflow module includes a first main overflow valve 4, a second main overflow valve 5 and a secondary overflow valve 7, the oil outlets of the first main overflow valve 4, the second main overflow valve 5 and the secondary overflow valve 7 are all connected to the fuel tank, and the oil inlet of the first main overflow valve 4 is connected to the first pipe, the oil inlet of the second main overflow valve 5 is connected to the second pipe, and the oil inlet of the secondary overflow valve 7 is connected to the first pipe and the second pipe at the same time, wherein the opening pressure of the secondary overflow valve 7 is less than The opening pressure of the first main overflow valve 4 and the second main overflow valve 5, the opening pressure of the first main overflow valve 4 and the second main overflow valve 5 is set to the first preset pressure, and the opening pressure of the secondary overflow valve 7 is set to the second preset pressure. The second preset pressure is less than the first preset pressure. When the pressure of the hydraulic oil provided by multiple hydraulic pump groups is greater than the pressure required by the execution unit, overflow is required through the overflow valve. First, when the pressure required by the execution unit is equal to the first preset pressure, the first main overflow valve 4 and the second main overflow valve 5 can be opened for overflow, and when the pressure required by the execution unit is equal to the second preset pressure, the secondary overflow valve 7 can be opened for overflow, thereby realizing multi-pressure level adjustment. Since multiple pump groups only need to use one secondary overflow valve 7 when performing secondary overflow, it can save costs, and the structure is simpler and more convenient to assemble.

[0026] In the embodiment, the overflow module further comprises a third main overflow valve 6, and the liquid supply module further comprises a third pump group 3 for supplying the execution unit with liquid. The oil inlet of the third pump group 3 is communicated with the oil tank, the oil outlet of the third pump group 3 is communicated with the execution unit through a fourth pipeline, the oil inlets of the third main overflow valve 6 and the secondary overflow valve 7 are communicated with the fourth pipeline, and the oil outlet of the third main overflow valve 6 is communicated with the oil tank. That is, a third pump group 3 can be additionally provided to supply the execution unit with liquid. Of course, a third main overflow valve 6 needs to be additionally provided. The secondary overflow valve 7 does not need to be additionally provided. Even if a fourth pump group, a fifth pump group or more pump groups are additionally provided, the secondary overflow valve 7 does not need to be additionally provided.

[0027] The opening pressure of the secondary overflow valve 7 is 230 bar, and the opening pressure of each of the first main overflow valve 4, the second main overflow valve 5 and the third main overflow valve 6 is 260 bar.

[0028] Specifically, the liquid supply module further comprises a first one-way valve 8, a second one-way valve 9 and a third one-way valve 10. The first one-way valve 8 is located on the first pipeline, the second one-way valve 9 is located on the second pipeline, and the third one-way valve 10 is located on the fourth pipeline. The openings of the first one-way valve 8, the second one-way valve 9 and the third one-way valve 10 all face the execution unit. That is, the hydraulic oil extracted by the first pump group 1, the second pump group 2 and the third pump group 3 needs to flow to the execution unit through the one-way valves. The oil backflow into the oil inlet cavity of the execution unit can be avoided, and the stability of the execution unit can be ensured.

[0029] The first pipeline comprises a first branch pipeline between the oil outlet of the first pump group 1 and the oil inlet of the first one-way valve 8 and a second branch pipeline between the oil outlet of the first one-way valve 8 and the execution unit. The second pipeline comprises a third branch pipeline between the oil outlet of the second pump group 2 and the oil inlet of the second one-way valve 9 and a fourth branch pipeline between the oil outlet of the second one-way valve 9 and the execution unit. The fourth pipeline comprises a fifth branch pipeline between the oil outlet of the third pump group 3 and the oil inlet of the third one-way valve 10 and a fourth branch pipeline between the oil outlet of the third one-way valve 10 and the execution unit. The first main overflow valve 4 is communicated with the first branch pipeline, the second main overflow valve 5 is communicated with the third branch pipeline, the third main overflow valve 6 is communicated with the fifth branch pipeline, and the secondary overflow valve 7 is communicated with the second branch pipeline, the fourth branch pipeline and the sixth branch pipeline. That is, the main overflow valve and the secondary overflow valve 7 are respectively located on the two sides of the one-way valve, which is more convenient for assembly.

[0030] In order to accurately control the secondary pressure overflow, the overflow module further comprises a plug-in valve 11. The oil inlet of the secondary overflow valve 7 is communicated with the first pipeline, the second pipeline and the fourth pipeline through a third pipeline. The plug-in valve 11 is located on the third pipeline and can control the opening or closing of the third pipeline. In the case that the third pipeline is closed, the overflow through the secondary overflow valve 7 is impossible, so as to ensure that the secondary pressure valve does not affect the oil pressure of the execution unit.

[0031] In order to achieve control of the cartridge valve 11, the overflow module also includes an electromagnetic reversing valve 12. The oil inlet of the electromagnetic reversing valve 12 is connected to the oil outlet of the cartridge valve 11, and the oil outlet of the electromagnetic reversing valve 12 is connected to the oil inlet of the secondary overflow valve 7. An electromagnet is provided on the electromagnetic reversing valve 12. When the electromagnet is energized, the oil inlet of the electromagnetic reversing valve 12 is connected to the oil outlet of the electromagnetic reversing valve 12. When the electromagnet of the electromagnetic reversing valve 12 loses power, the oil inlet and the oil outlet of the electromagnetic reversing valve 12 are not connected. At this time, the hydraulic oil cannot enter the secondary overflow valve 7 through the electromagnetic reversing valve 12, thereby realizing the cut-off of the hydraulic oil. When it is energized, the hydraulic oil can normally enter the secondary overflow valve 7 and then overflow.

[0032] Specifically, the first pump group 1, the second pump group 2 and the third pump group 3 all include a hydraulic pump and a motor. The motor is electrically connected to the hydraulic pump to provide electrical energy for the operation of the hydraulic pump. The oil inlet of the hydraulic pump is connected to the oil tank through a fifth pipe. The liquid supply module also includes a filter 13. The filter 13 is installed on one end of the fifth pipe located in the oil tank. That is, when the hydraulic pump draws hydraulic oil, its hydraulic oil needs to be filtered through the filter 13 to prevent impurities from clogging the hydraulic pump.

[0033] The technical solution of the present invention has been described in detail above with reference to the accompanying drawings, and the embodiments described are intended to help understand the concept of the present invention. The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art of the present invention may make various modifications or additions to the described specific embodiments, or adopt similar methods to replace them, without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, terms such as "first," "second," and "an" in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features 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.

[0036] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0037] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

Claims

1. A multi-stage overflow circuit of a multi-pump multi-pressure level hydraulic system, characterized in that: The system comprises a liquid supply module and an overflow module, wherein the liquid supply module comprises an oil tank and a first pump group and a second pump group for supplying liquid to the execution unit, wherein the oil inlets of the first pump group and the second pump group are both connected to the oil tank, and the oil outlet of the first pump group is connected to the oil inlet of the execution unit through a first pipeline, and the oil outlet of the second pump group is connected to the oil inlet of the execution unit through a second pipeline; The overflow module includes a first main overflow valve, a second main overflow valve and a secondary overflow valve. The oil outlets of the first main overflow valve, the second main overflow valve and the secondary overflow valve are all connected to the oil tank, and the oil inlet of the first main overflow valve is connected to the first pipeline, the oil inlet of the second main overflow valve is connected to the second pipeline, the oil inlet of the secondary overflow valve is connected to the first pipeline and the second pipeline at the same time, and the opening pressure of the secondary overflow valve is less than the opening pressure of the first main overflow valve and the second main overflow valve.

2. The multi-stage overflow circuit of a multi-pump multi-pressure level hydraulic system according to claim 1, characterized in that: The liquid supply module further includes a first one-way valve and a second one-way valve. The first one-way valve is located on the first pipeline, and the second one-way valve is located on the second pipeline. The openings of the first one-way valve and the second one-way valve are both facing the execution unit.

3. The multi-stage overflow circuit of a multi-pump multi-pressure level hydraulic system according to claim 2, characterized in that: The first pipeline includes a first branch pipeline located between the oil outlet of the first pump group and the oil inlet of the first one-way valve, and a second branch pipeline located between the oil outlet of the first one-way valve and the execution unit; the second pipeline includes a third branch pipeline located between the oil outlet of the second pump group and the oil inlet of the second one-way valve, and a fourth branch pipeline located between the oil outlet of the second one-way valve and the execution unit; The first main overflow valve is in communication with the first branch pipe, the second main overflow valve is in communication with the third branch pipe, and the secondary overflow valve is in communication with both the second branch pipe and the fourth branch pipe.

4. The multi-stage overflow circuit of a multi-pump multi-pressure-stage hydraulic system according to claim 1, characterized in that: The overflow module further includes a cartridge valve, the oil inlet of the secondary overflow valve is connected to the first pipeline and the second pipeline through a third pipeline, the cartridge valve is located on the third pipeline and can control the third pipeline to be opened or closed.

5. The multi-stage overflow circuit of a multi-pump multi-pressure-stage hydraulic system according to claim 4, characterized in that: The overflow module also includes an electromagnetic reversing valve, the oil inlet of the electromagnetic reversing valve is connected to the oil outlet of the cartridge valve, the oil outlet of the electromagnetic reversing valve is connected to the oil inlet of the secondary overflow valve, and an electromagnet is provided on the electromagnetic reversing valve. When the electromagnet is energized, the oil inlet of the electromagnetic reversing valve is connected to the oil outlet of the electromagnetic reversing valve.

6. The multi-stage overflow circuit of a multi-pump multi-pressure-stage hydraulic system according to claim 1, characterized in that: The liquid supply module also includes a third pump group for supplying liquid to the execution unit, and the overflow module also includes a third main overflow valve. The oil inlet of the third pump group is connected to the oil tank, and the oil outlet of the third pump group is connected to the execution unit through a fourth pipeline. The oil inlets of the third main overflow valve and the secondary overflow valve are both connected to the fourth pipeline, and the oil outlet of the third main overflow valve is connected to the oil tank.

7. The multi-stage overflow circuit of a multi-pump multi-pressure-stage hydraulic system according to claim 6, characterized in that: The liquid supply module further includes a third one-way valve, which is located on the fourth pipeline, and an opening of the third one-way valve faces the execution unit.

8. The multi-stage overflow circuit of a multi-pump multi-pressure-stage hydraulic system according to claim 7, characterized in that: The fourth pipeline includes a fifth branch pipeline located between the oil inlet of the third one-way valve and the oil outlet of the third pump group, and a sixth branch pipeline located between the oil outlet of the third one-way valve and the execution unit. The oil inlet of the third main overflow valve is connected to the fifth branch pipeline, and the oil inlet of the secondary overflow valve is connected to the sixth branch pipeline.

9. The multi-stage overflow circuit of a multi-pump multi-pressure-stage hydraulic system according to claim 6, characterized in that: The first pump group, the second pump group and the third pump group all include a hydraulic pump and a motor. The motor is electrically connected to the hydraulic pump. The oil inlets of the hydraulic pumps are all connected to the oil tank through a fifth pipeline.

10. The multi-stage overflow circuit of a multi-pump multi-pressure-stage hydraulic system according to claim 9, characterized in that: The liquid supply module further includes a filter, which is installed on one end of the fifth pipe located in the oil tank.

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