Single hydraulic pump fluid treatment system

Abstract

The utility model discloses a single hydraulic pump fluid treatment system, which comprises a hydraulic oil tank, a hydraulic pump, a hydraulic pump and a hydraulic pump, an oil inlet of the single hydraulic pump is connected with the hydraulic oil tank through an oil suction pipeline; the main pressure pipeline is connected to an oil outlet of the single hydraulic pump; the oil return pipeline connectors are arranged on the hydraulic oil tank; the oil return control valve group is arranged at the front end of the oil return pipeline interface, the oil return control valve group comprises a pressure increasing valve used for sucking oil return equipment and a pre-filter used for filtering, and an outlet of the pre-filter is communicated with the oil return pipeline interface; the refueling tank communicates with the hydraulic oil tank. In conclusion, the single pump, pressurizing oil return, double oil filling tanks and central overflow serve as core innovation, the industrial defects that a traditional hydraulic station is large in occupied space, difficult to maintain, poor in cleanliness and prone to oil spilling are overcome, and the hydraulic station can be widely applied to machine tools, injection molding machines, die-casting machines, servo test stands and other occasions where hydraulic oil needs to be continuously cleaned.

Description

Technical Field

[0001] This utility model relates to fluid handling systems, and more particularly to a single hydraulic pump fluid handling system. Background Technology

[0002] The following two return oil schemes are commonly used in existing small and medium-sized hydraulic power units:

[0003] One type is gravity return oil combined with in-tank fine filtration. Its return oil flows naturally into the oil tank by relying on the height difference. It has high back pressure and is easy to draw in air, forming emulsion. The filter element is installed inside the oil tank. Replacement requires stopping the machine, draining the oil, and removing the cover, with maintenance time >1 hour. Moreover, the oil replenishment port and overflow port are separate, occupying a large area. If oil is accidentally added, it is very easy to spray oil and pollute the ground.

[0004] Another option is a dual-pump solution (one main and one backup), where the main pump supplies pressure and the auxiliary pump returns oil for cooling and filtration. This system is complex and costly; the simultaneous operation of two motors results in high energy consumption; furthermore, it is bulky and cannot be integrated into compact equipment.

[0005] The above solutions are insufficient for scenarios requiring continuous operation, limited space, high cleanliness, and easy maintenance. Therefore, research can be conducted on a new hydraulic station system. Utility Model Content

[0006] To address the shortcomings of the aforementioned technologies, this invention provides a single hydraulic pump fluid processing system.

[0007] To solve the above technical problems, the technical solution adopted by this utility model is: a single hydraulic pump fluid processing system, comprising:

[0008] Hydraulic oil tank, used to store hydraulic oil;

[0009] A single hydraulic pump, whose oil inlet is connected to the hydraulic oil tank via an oil suction pipe;

[0010] The main pressure line is connected to the outlet of the single hydraulic pump;

[0011] There are several return oil line interfaces, which are located on the hydraulic oil tank.

[0012] The return oil control valve assembly is located at the front end of the return oil pipeline interface. The return oil control valve assembly includes a booster valve for sucking up the return oil equipment and a pre-filter for filtering. The outlet of the pre-filter is connected to the return oil pipeline interface.

[0013] The fuel tank is connected to the hydraulic oil tank.

[0014] Furthermore, there are two fuel tanks, both located above the top of the hydraulic oil tank and connected to it.

[0015] Furthermore, a one-way overflow pipe is provided at the upper center of the hydraulic oil tank, and the overflow direction of the one-way overflow pipe is unidirectional from the inside of the hydraulic oil tank to the outside.

[0016] Furthermore, the one-way overflow pipe can be connected to the two fuel tanks via a hose.

[0017] Furthermore, the single hydraulic pump can be a gear pump, vane pump, or piston pump.

[0018] Furthermore, a manual / automatic valve is installed on the pipeline between the fuel tank and the hydraulic oil tank.

[0019] Furthermore, the outlet of the pre-filter is simultaneously connected to all return oil line interfaces via a distributor.

[0020] This utility model provides a single hydraulic pump fluid handling system, which has the following advantages:

[0021] With its compact structure and reduced costs, the traditional dual-pump system is replaced by a "single hydraulic pump + booster valve + pre-filter", which reduces hardware costs. The return oil control valve group is integrated with the top of the oil tank, resulting in a small footprint for the whole machine, which can be directly embedded into the base of a machine tool or test bench.

[0022] The filter elements are easy to replace, the pre-filter is external, and the filter element replacement time is short; the cleanliness is improved, the element life is extended, the pressure valve provides back pressure, and the oil is forced to pass through the filter element, improving the cleanliness of the system;

[0023] With dual fuel tanks and a central one-way overflow pipe, it achieves fuel replenishment, venting, and overflow in one, eliminating fuel spraying;

[0024] Single-pump operation results in lower motor power, saving more than 30% in motor and power distribution capacity compared to dual-pump systems;

[0025] In summary, this patent, with its core innovation of "single pump + boosted return oil + dual oil tanks + central overflow", solves the industry pain points of traditional hydraulic stations such as "large footprint, difficult maintenance, poor cleanliness, and easy oil spillage". It can be widely used in machine tools, injection molding machines, die casting machines, servo test benches and other occasions that require continuous cleaning of hydraulic oil. Attached Figure Description

[0026] Figure 1 This is the front view of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the present invention as a window sash.

[0028] Figure 3 This is a schematic diagram showing the structure of the return oil pipeline interface located on the hydraulic oil tank.

[0029] Figure 4 This is a schematic diagram of the return oil control valve assembly.

[0030] In the diagram: 1. Hydraulic oil tank; 2. Single hydraulic pump; 3. Main pressure pipeline; 4. Return oil pipeline interface; 5. Return oil control valve assembly; 6. Oil tank; 7. One-way overflow pipe; 21. Suction pipeline; 51. Pressure booster valve; 52. Pre-filter; 53. Return oil pipeline interface; 54. Diverter. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0032] In this embodiment, as Figure 1 The single hydraulic pump fluid handling system shown has the following overall structure: A hydraulic oil tank 1 is located at the bottom of the system. The tank body is made of 4mm Q235B steel plate, bent and welded, with dimensions of 1000mm×800mm×900mm and an effective volume of 300L, used to store hydraulic oil. Two magnetic rods are installed at the bottom of the tank body to attract iron particles. Two oil tanks 6 are symmetrically arranged above the top of the hydraulic oil tank 1. Both are connected to the hydraulic oil tank 1 through pipelines with manual or automatic valves. A φ200mm circular hole is opened at the center of the upper end of the hydraulic oil tank 1 for welding a one-way overflow pipe 7. The overflow direction is unidirectional, flowing from the inside of the hydraulic oil tank 1 to the outside. This one-way overflow pipe 7 can simultaneously connect to the two oil tanks 6 through a hose to achieve overflow protection. The one-way overflow pipe 7 is made of anodized aluminum, 300mm in length, and has a built-in spring-loaded one-way valve with an opening pressure of 0.05 MPa. In other embodiments, the one-way overflow pipe 7 can also be combined with a one-way valve to form a one-way pipe.

[0033] like Figure 1 and Figure 2 As shown, the oil inlet of the single hydraulic pump 2 is connected to the flange at the oil outlet of the hydraulic oil tank 1 through the oil suction pipe 21. The oil suction pipe 21 is made of 2SN standard oil-resistant rubber. The single hydraulic pump 2 can be a gear pump, vane pump or piston pump. In this embodiment, a low-cost gear pump is used, with a rated pressure of 25MPa, a displacement of 40 mL / r, a motor power of 15kW, and a four-pole 1450rpm. Its oil outlet is connected to the main pressure pipe 3, which pumps hydraulic oil to each actuator. The main pressure pipe 3 is made of model 20# cold-drawn seamless steel pipe with an outer diameter of 42mm and a wall thickness of 4mm. In other embodiments, a high-pressure ball valve, pressure gauge, accumulator interface and relief valve can be installed along the pipeline to ensure overload protection.

[0034] like Figure 3 and Figure 4As shown, the system's return oil path is through the return oil control valve assembly 5, which is located at the front end of the return oil pipeline interface 4. The return oil control valve assembly 5 includes a booster valve 51 (hydraulic booster valve) for absorbing return oil from the equipment and a pre-filter 52 for filtering. The outlet of the pre-filter 52 is connected to the return oil pipeline interface 4. The path is as follows: each return oil equipment first returns through the return oil control valve assembly 5; the return oil control valve assembly 5 is placed at the front end of several return oil pipeline interfaces 4 on the hydraulic oil tank 1, and inside it are a booster valve 51 for absorbing oil from the return oil equipment and a pre-filter 52 for filtering impurities; the outlet end of the pre-filter 52 is connected to a distributor 54, which simultaneously connects to all return oil pipeline interfaces 4. The distributor 54 is a single-inlet multi-outlet (such as a single-inlet double-outlet valve), so that the clean hydraulic oil after boosting and filtering flows back evenly to the hydraulic oil tank 1 to complete the circulation.

[0035] This patented single hydraulic pump fluid handling system has operating logic under four typical working conditions:

[0036] I. Cold start-up condition

[0037] Hydraulic oil tank 1 provides sufficient reserves. The motor of the single hydraulic pump 2 (gear pump) starts in a star-delta configuration. The suction line 21 draws oil from the suction area of ​​the tank under negative pressure to establish the initial flow rate. The main pressure line 3 has high resistance to cold oil flow, and the relief valve maintains full flow bypass, allowing the system to circulate and heat up under low pressure.

[0038] The pressure boosting valve 51 of the return oil control valve group 5 does not operate temporarily, and the pre-filter 52 achieves pressureless pre-lubrication only through a small leak.

[0039] The manual / automatic valve between the oil tank 6 and the hydraulic oil tank 1 is closed and does not participate in the circulation.

[0040] The spring-loaded one-way overflow pipe 7 closes to prevent cold oil from overflowing.

[0041] II. Steady-state operating conditions

[0042] Hydraulic oil tank 1 provides sufficient reserves;

[0043] The single hydraulic pump and two gear pumps continuously output a steady-state flow rate of 25 MPa and 40 mL / r, while the motor is 15 kW and operates at a constant speed of 1450 rpm.

[0044] High-pressure oil in the main pressure pipeline 3 is delivered to each actuator via seamless steel pipe, and accumulators and pressure gauges along the way maintain constant pressure.

[0045] The booster valve 51 (miniature gear pump) of the return oil control valve group 5 is activated, providing a back pressure of 0.3 MPa to overcome the height difference and filter resistance;

[0046] The pre-filter 52 is used for online filtration with a pressure difference of <0.15 MPa.

[0047] The distributor 54 distributes the clean oil evenly to five return oil line interfaces 4, with multiple return points to avoid localized impact.

[0048] The 6 valve on the fuel tank is normally closed, serving only as a visual fuel level redundancy.

[0049] The spring in the one-way overflow pipe 7 remains closed, and there is no overflow in steady state.

[0050] III. Thermal expansion or accidental oil replenishment conditions

[0051] The hydraulic oil tank 1 experienced a sudden rise in oil level due to the expansion of the oil volume or excessive oil replenishment.

[0052] The 0.05 MPa opening pressure of the one-way overflow pipe 7 is broken, and the oil is diverted to the two oil tanks 6 through the hose, achieving zero leakage.

[0053] The remaining components—pumps, valves, and pipelines—remain in their original working state, and the system will not shut down.

[0054] IV. Filter Cart Clog Maintenance Conditions

[0055] When the differential pressure of the pre-filter 52 rises to 0.35 MPa, the bypass valve opens to ensure uninterrupted system flow.

[0056] The booster valve 51 continues to operate to maintain the back pressure of the return oil and prevent air bubbles from flowing back in.

[0057] If refueling tank 6 needs to be replenished, the valve can be opened manually or the automatic ball valve can be used to replenish the fuel level.

[0058] The bottom of the hydraulic oil tank 1 has an outlet for sewage discharge. The magnetic rod can be pulled out for cleaning without affecting the main circulation.

[0059] Main pressure line 3, single hydraulic pump 2: No downtime during operation, maintenance window only involves external filter replacement.

[0060] The above embodiments are not intended to limit the present utility model, nor is the present utility model limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present utility model are also within the protection scope of the present utility model.

Claims

1. A single hydraulic pump fluid handling system, characterized in that, include: Hydraulic oil tank (1), used to store hydraulic oil; A single hydraulic pump (2) has its oil inlet connected to the hydraulic oil tank (1) via an oil suction pipe (21); The main pressure line (3) is connected to the oil outlet of the single hydraulic pump (2); There are several return oil line interfaces (4) and they are located on the hydraulic oil tank (1); The return oil control valve assembly (5) is located at the front end of the return oil pipeline interface (4). The return oil control valve assembly (5) includes a booster valve (51) for drawing back the oil and a pre-filter (52) for filtering. The outlet of the pre-filter (52) is connected to the return oil pipeline interface (4). The oil tank (6) is connected to the hydraulic oil tank (1).

2. The single hydraulic pump fluid handling system according to claim 1, characterized in that, There are two refueling tanks (6), both of which are located above the top of the hydraulic oil tank (1) and are connected to the hydraulic oil tank (1).

3. The single hydraulic pump fluid handling system according to claim 1, characterized in that, The hydraulic oil tank (1) is provided with a one-way overflow pipe (7) at the upper center. The overflow direction of the one-way overflow pipe (7) is one-way from the inside of the hydraulic oil tank (1) to the outside.

4. The single hydraulic pump fluid handling system according to claim 3, characterized in that, The one-way overflow pipe can be connected to the two fuel tanks (6) via a hose.

5. The single hydraulic pump fluid handling system according to claim 3, characterized in that, The single hydraulic pump (2) is a gear pump, vane pump or piston pump.

6. The single hydraulic pump fluid handling system according to claim 3, characterized in that, The pipeline between the fuel tank (11) and the hydraulic oil tank (1) is equipped with a manual / automatic valve.

7. The single hydraulic pump fluid handling system according to claim 3, characterized in that, The outlet end of the pre-filter (52) is simultaneously connected to all return oil line interfaces (4) via a splitter (54).

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