Hydraulic circuit for stabilizing system pressure in short term

Abstract

The utility model discloses a hydraulic circuit for stabilizing system pressure in a short term, which relates to the technical field of hydraulic systems and comprises an oil pump, an energy accumulator, a pressure sensor, a one-way valve, an electromagnetic valve and an oil cylinder. An oil inlet of the oil pump is communicated with the oil tank, an oil outlet of the oil pump is communicated with the inlet end of the one-way valve, the outlet end of the one-way valve is communicated with a pressure port of the electromagnetic valve, a first connector and a second connector of the electromagnetic valve are communicated with a rod cavity and a rodless cavity of the oil cylinder respectively, and an oil return port of the electromagnetic valve is communicated with the oil tank. And an energy accumulator and a pressure sensor are arranged on a pipeline between the one-way valve and the electromagnetic valve. The hydraulic circuit for stabilizing the system pressure in a short time is simple in structure and low in cost. The energy accumulator, the pressure sensor and the one-way valve are additionally arranged on the basis of an original traditional hydraulic circuit, so that pressure stability of the hydraulic circuit is achieved, and the problem that an executing element oil cylinder stops working is solved. The loop is wide in application range and high in adaptability.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, in particular to a hydraulic circuit for stabilizing the system pressure in the short term. Background Art

[0002] The function of a hydraulic system is to increase the acting force by changing the pressure. A complete hydraulic system consists of five parts, namely a power element, an actuator, a control element, an auxiliary element, and hydraulic oil. According to the actual situation, components can be reasonably selected to achieve better use effects. Due to the characteristic that hydraulic equipment works continuously for a long time and the three-phase asynchronous motor providing power cannot be started and stopped frequently, in some technological actions that do not require power, the motor drives the oil pump to directly return to the fuel tank, without performing any useful work, and also causes the heating of the hydraulic oil, resulting in waste of resources.

[0003] Therefore, there is an urgent need for a hydraulic circuit for stabilizing the system pressure in the short term. Summary of the Invention

[0004] To solve the problems existing in the above-mentioned prior art, the purpose of the utility model is to provide a hydraulic circuit for stabilizing the system pressure in the short term to stabilize the pressure of the hydraulic system.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a hydraulic circuit for stabilizing the system pressure in the short term, which includes an oil pump, an accumulator, a pressure sensor, a check valve, a solenoid valve, and an oil cylinder; the inlet of the oil pump is communicated with the fuel tank, the outlet of the oil pump is communicated with the inlet end of the check valve, the outlet end of the check valve is communicated with the pressure port of the solenoid valve, the first interface and the second interface of the solenoid valve are respectively communicated with the rod chamber and the non-rod chamber of the oil cylinder, and the oil return port of the solenoid valve is communicated with the fuel tank; the accumulator and the pressure sensor are arranged on the pipeline between the check valve and the solenoid valve.

[0007] Optionally, the solenoid valve is a three-position four-way electromagnetic reversing valve.

[0008] Optionally, an overflow branch is arranged between the oil pump and the check valve, the outlet end of the overflow branch is communicated with the fuel tank, and an overflow valve is arranged on the overflow branch.

[0009] The utility model has obtained the following technical effects compared with the prior art:

[0010] The hydraulic circuit for short-term stabilizing the system pressure of the utility model has a simple structure and low cost. By adding an accumulator, a pressure sensor and a check valve on the basis of the original traditional hydraulic circuit, the pressure of the hydraulic circuit is stabilized, thus solving the problem that the actuator cylinder stops working. This circuit has a wide range of applications and strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0012] Figure 1 It is a schematic diagram of the hydraulic circuit for short-term stabilizing the system pressure in the present utility model.

[0013] DESCRIPTION OF THE REFERENCE NUMERALS

[0014] 1. Accumulator; 2. Pressure sensor; 3. Check valve; 4. Three-position four-way solenoid directional control valve; 5. Relief valve; 6. Oil pump; 7. Cylinder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0016] To make the above objects, features and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0017] As Figure 1 shown, this embodiment provides a hydraulic circuit for short-term stabilizing the system pressure, including an oil pump 6, an accumulator 1, a pressure sensor 2, a check valve 3, a solenoid valve and a cylinder 7; the inlet of the oil pump 6 is communicated with the fuel tank, the outlet of the oil pump 6 is communicated with the inlet end of the check valve 3, the outlet end of the check valve 3 is communicated with the pressure port of the solenoid valve, the first interface and the second interface of the solenoid valve are respectively communicated with the rod chamber and the rodless chamber of the cylinder 7, and the oil return port of the solenoid valve is communicated with the fuel tank; an accumulator 1 and a pressure sensor 2 are arranged on the pipeline between the check valve 3 and the solenoid valve.

[0018] In this specific embodiment, the solenoid valve is a three-position four-way solenoid directional control valve 4. An overflow branch is provided between the oil pump 6 and the check valve 3. The outlet end of the overflow branch is communicated with the fuel tank, and an overflow valve 5 is provided on the overflow branch.

[0019] Under normal circumstances, the motor drives the oil pump 6 to work. The pressurized oil passes through the check valve 3 and the three-position four-way solenoid directional control valve 4 and enters the actuator cylinder 7. The three-position four-way solenoid directional control valve 4 completes the control of the actuator cylinder 7. When the oil pump 6 fails, the oil stored in the accumulator 1 enters the pipeline to maintain the stability of the system pressure. The pressure sensor 2 detects the pressure fluctuation and feeds it back to the control system. The maintenance personnel carry out the inspection of the equipment. The check valve 3 can prevent the reverse flow of the oil. The check valve 3 is used to make the oil stored in the accumulator 1 enter the pipeline to keep the cylinder 7 in a certain state, rather than making the oil stored in the accumulator 1 flow back to the fuel tank through the oil pump 6.

[0020] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0021] In this specification, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A hydraulic circuit for short-term stabilization of system pressure, characterized in that: It includes an oil pump, an accumulator, a pressure sensor, a one-way valve, a solenoid valve and an oil cylinder; the oil inlet of the oil pump is connected to the oil tank, the oil outlet of the oil pump is connected to the inlet end of the one-way valve, the outlet end of the one-way valve is connected to the pressure port of the solenoid valve, the first interface and the second interface of the solenoid valve are connected to the rod chamber and the rodless chamber of the oil cylinder respectively, and the oil return port of the solenoid valve is connected to the oil tank; the accumulator and the pressure sensor are arranged on the pipeline between the one-way valve and the solenoid valve.

2. The hydraulic circuit for short-term stabilization of system pressure according to claim 1, characterized in that: The solenoid valve is a three-position four-way solenoid reversing valve.

3. The hydraulic circuit for short-term stabilization of system pressure according to claim 1, characterized in that: An overflow branch is arranged between the oil pump and the one-way valve, the outlet end of the overflow branch is connected with the oil tank, and an overflow valve is arranged on the overflow branch.

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